Can this PHP statement with a isset() check be simplified?












6















Needing to check whether the item exists in the array and either add to it or increase the value by the amount.



if(isset($this->_costRemovedByLineItem[$objectId])) {
$this->_costRemovedByLineItem[$objectId] += $amount;
}else{
$this->_costRemovedByLineItem[$objectId] = $amount;
}


I have a feeling this can be simplified.










share|improve this question























  • What version of PHP?

    – Nick
    4 hours ago











  • Instead of trying to "simplify", go for code readability, you'll thank yourself later. Imho also go ahead and add a check for if is that property an array or not and add a handling for that scenario, cause php ain't letting you set an index for a boolean, now is it. 1 more vector of error squashed.

    – Mohd Abdul Mujib
    2 hours ago


















6















Needing to check whether the item exists in the array and either add to it or increase the value by the amount.



if(isset($this->_costRemovedByLineItem[$objectId])) {
$this->_costRemovedByLineItem[$objectId] += $amount;
}else{
$this->_costRemovedByLineItem[$objectId] = $amount;
}


I have a feeling this can be simplified.










share|improve this question























  • What version of PHP?

    – Nick
    4 hours ago











  • Instead of trying to "simplify", go for code readability, you'll thank yourself later. Imho also go ahead and add a check for if is that property an array or not and add a handling for that scenario, cause php ain't letting you set an index for a boolean, now is it. 1 more vector of error squashed.

    – Mohd Abdul Mujib
    2 hours ago
















6












6








6


1






Needing to check whether the item exists in the array and either add to it or increase the value by the amount.



if(isset($this->_costRemovedByLineItem[$objectId])) {
$this->_costRemovedByLineItem[$objectId] += $amount;
}else{
$this->_costRemovedByLineItem[$objectId] = $amount;
}


I have a feeling this can be simplified.










share|improve this question














Needing to check whether the item exists in the array and either add to it or increase the value by the amount.



if(isset($this->_costRemovedByLineItem[$objectId])) {
$this->_costRemovedByLineItem[$objectId] += $amount;
}else{
$this->_costRemovedByLineItem[$objectId] = $amount;
}


I have a feeling this can be simplified.







php






share|improve this question













share|improve this question











share|improve this question




share|improve this question










asked 4 hours ago









lukemhlukemh

2,15762135




2,15762135













  • What version of PHP?

    – Nick
    4 hours ago











  • Instead of trying to "simplify", go for code readability, you'll thank yourself later. Imho also go ahead and add a check for if is that property an array or not and add a handling for that scenario, cause php ain't letting you set an index for a boolean, now is it. 1 more vector of error squashed.

    – Mohd Abdul Mujib
    2 hours ago





















  • What version of PHP?

    – Nick
    4 hours ago











  • Instead of trying to "simplify", go for code readability, you'll thank yourself later. Imho also go ahead and add a check for if is that property an array or not and add a handling for that scenario, cause php ain't letting you set an index for a boolean, now is it. 1 more vector of error squashed.

    – Mohd Abdul Mujib
    2 hours ago



















What version of PHP?

– Nick
4 hours ago





What version of PHP?

– Nick
4 hours ago













Instead of trying to "simplify", go for code readability, you'll thank yourself later. Imho also go ahead and add a check for if is that property an array or not and add a handling for that scenario, cause php ain't letting you set an index for a boolean, now is it. 1 more vector of error squashed.

– Mohd Abdul Mujib
2 hours ago







Instead of trying to "simplify", go for code readability, you'll thank yourself later. Imho also go ahead and add a check for if is that property an array or not and add a handling for that scenario, cause php ain't letting you set an index for a boolean, now is it. 1 more vector of error squashed.

– Mohd Abdul Mujib
2 hours ago














3 Answers
3






active

oldest

votes


















5














This method reduces it a bit, as you don't need the else statement or to assign amount twice.



if(!isset($this->_costRemovedByLineItem[$objectId])) {
$this->_costRemovedByLineItem[$objectId] = 0;
}
$this->_costRemovedByLineItem[$objectId] += $amount;





share|improve this answer































    5














    Something that will work in all versions of PHP:



    @$this->_costRemovedByLineItem[$objectId] += $amount;


    The @ (error control operator) will cause PHP to ignore the error caused by the non-existent index, create the element (with an empty value) and then add $amount to it, resulting in a value of $amount (as the empty value gets converted to 0 as a number).




    Warning use of the @ operator could potentially make it harder to debug
    your code, as it will hide error messages that you may have
    needed to see (for example, even if $this doesn't exist, or there is
    no object element called _costRemovedByLineItem, PHP will create
    them along with the array). See the third case in my example code.




    Alternatively in PHP7 you can use the Null Coalescing Operator:



    $this->_costRemovedByLineItem[$objectId] = ($this->_costRemovedByLineItem[$objectId] ?? 0) + $amount;


    And in PHP < 7 you can use the ternary operator



    $this->_costRemovedByLineItem[$objectId] = (isset($this->_costRemovedByLineItem[$objectId]) ? $this->_costRemovedByLineItem[$objectId] : 0) + $amount;


    A shorter example of each:



    $amount = 4;
    @$a[5] += $amount;
    print_r($a);
    $b[6] = ($b[6] ?? 0) + $amount;
    print_r($b);
    @$c->x[5] += $amount;
    print_r($c);
    $d[3] = (isset($d[3]) ? $d[3] : 0) + $amount;
    print_r($d);


    Output:



    Array ( [5] => 4 ) 
    Array ( [6] => 4 )
    stdClass Object (
    [x] => Array ( [5] => 4 )
    )
    Array ( [3] => 4 )


    Demo on 3v4l.org






    share|improve this answer


























    • Now that is nice

      – Siavas
      3 hours ago






    • 1





      The null coalescing example is great imho, but the first example can be really problematic when debugging. I'd never recommend using @. What if _costRemovedByLineItem is deleted, or is an object. The code will fail without any error in anything under 7.1: 3v4l.org/pvvrX

      – Devon
      3 hours ago













    • @Devon the failure in your demo occurs when _costRemovedByLineItem is an object, but if it is OPs code will also fail as they are trying to use it as an array too.

      – Nick
      3 hours ago



















    0














    Ternary operators!



    $this->_costRemovedByLineItem[$objectId] = 
    (isset($this->_costRemovedByLineItem[$objectId])) ?
    $this->_costRemovedByLineItem[$objectId] + $amount :
    $amount;


    One sec... is this actually simpler?



    But maybe...



    $this->_costRemovedByLineItem[$objectId] = $this->_costRemovedByLineItem[$objectId] ?? 0;
    $this->_costRemovedByLineItem[$objectId] += $amount;


    This is for PHP 7+ only though. Or if you don't mind E_NOTICEs, from PHP 5.3:



    $this->_costRemovedByLineItem[$objectId] = $this->_costRemovedByLineItem[$objectId] ?: 0;
    $this->_costRemovedByLineItem[$objectId] += $amount;


    One sec... this we just make the code harder to understand with not much improved?






    share|improve this answer
























    • Yeah, I agree all the solutions are a little shorter, but I am not sure they improve readability much.

      – lukemh
      3 hours ago











    • Yep, this is what I was trying to say :)

      – Siavas
      3 hours ago











    Your Answer






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    3 Answers
    3






    active

    oldest

    votes








    3 Answers
    3






    active

    oldest

    votes









    active

    oldest

    votes






    active

    oldest

    votes









    5














    This method reduces it a bit, as you don't need the else statement or to assign amount twice.



    if(!isset($this->_costRemovedByLineItem[$objectId])) {
    $this->_costRemovedByLineItem[$objectId] = 0;
    }
    $this->_costRemovedByLineItem[$objectId] += $amount;





    share|improve this answer




























      5














      This method reduces it a bit, as you don't need the else statement or to assign amount twice.



      if(!isset($this->_costRemovedByLineItem[$objectId])) {
      $this->_costRemovedByLineItem[$objectId] = 0;
      }
      $this->_costRemovedByLineItem[$objectId] += $amount;





      share|improve this answer


























        5












        5








        5







        This method reduces it a bit, as you don't need the else statement or to assign amount twice.



        if(!isset($this->_costRemovedByLineItem[$objectId])) {
        $this->_costRemovedByLineItem[$objectId] = 0;
        }
        $this->_costRemovedByLineItem[$objectId] += $amount;





        share|improve this answer













        This method reduces it a bit, as you don't need the else statement or to assign amount twice.



        if(!isset($this->_costRemovedByLineItem[$objectId])) {
        $this->_costRemovedByLineItem[$objectId] = 0;
        }
        $this->_costRemovedByLineItem[$objectId] += $amount;






        share|improve this answer












        share|improve this answer



        share|improve this answer










        answered 4 hours ago









        DevonDevon

        22.8k42746




        22.8k42746

























            5














            Something that will work in all versions of PHP:



            @$this->_costRemovedByLineItem[$objectId] += $amount;


            The @ (error control operator) will cause PHP to ignore the error caused by the non-existent index, create the element (with an empty value) and then add $amount to it, resulting in a value of $amount (as the empty value gets converted to 0 as a number).




            Warning use of the @ operator could potentially make it harder to debug
            your code, as it will hide error messages that you may have
            needed to see (for example, even if $this doesn't exist, or there is
            no object element called _costRemovedByLineItem, PHP will create
            them along with the array). See the third case in my example code.




            Alternatively in PHP7 you can use the Null Coalescing Operator:



            $this->_costRemovedByLineItem[$objectId] = ($this->_costRemovedByLineItem[$objectId] ?? 0) + $amount;


            And in PHP < 7 you can use the ternary operator



            $this->_costRemovedByLineItem[$objectId] = (isset($this->_costRemovedByLineItem[$objectId]) ? $this->_costRemovedByLineItem[$objectId] : 0) + $amount;


            A shorter example of each:



            $amount = 4;
            @$a[5] += $amount;
            print_r($a);
            $b[6] = ($b[6] ?? 0) + $amount;
            print_r($b);
            @$c->x[5] += $amount;
            print_r($c);
            $d[3] = (isset($d[3]) ? $d[3] : 0) + $amount;
            print_r($d);


            Output:



            Array ( [5] => 4 ) 
            Array ( [6] => 4 )
            stdClass Object (
            [x] => Array ( [5] => 4 )
            )
            Array ( [3] => 4 )


            Demo on 3v4l.org






            share|improve this answer


























            • Now that is nice

              – Siavas
              3 hours ago






            • 1





              The null coalescing example is great imho, but the first example can be really problematic when debugging. I'd never recommend using @. What if _costRemovedByLineItem is deleted, or is an object. The code will fail without any error in anything under 7.1: 3v4l.org/pvvrX

              – Devon
              3 hours ago













            • @Devon the failure in your demo occurs when _costRemovedByLineItem is an object, but if it is OPs code will also fail as they are trying to use it as an array too.

              – Nick
              3 hours ago
















            5














            Something that will work in all versions of PHP:



            @$this->_costRemovedByLineItem[$objectId] += $amount;


            The @ (error control operator) will cause PHP to ignore the error caused by the non-existent index, create the element (with an empty value) and then add $amount to it, resulting in a value of $amount (as the empty value gets converted to 0 as a number).




            Warning use of the @ operator could potentially make it harder to debug
            your code, as it will hide error messages that you may have
            needed to see (for example, even if $this doesn't exist, or there is
            no object element called _costRemovedByLineItem, PHP will create
            them along with the array). See the third case in my example code.




            Alternatively in PHP7 you can use the Null Coalescing Operator:



            $this->_costRemovedByLineItem[$objectId] = ($this->_costRemovedByLineItem[$objectId] ?? 0) + $amount;


            And in PHP < 7 you can use the ternary operator



            $this->_costRemovedByLineItem[$objectId] = (isset($this->_costRemovedByLineItem[$objectId]) ? $this->_costRemovedByLineItem[$objectId] : 0) + $amount;


            A shorter example of each:



            $amount = 4;
            @$a[5] += $amount;
            print_r($a);
            $b[6] = ($b[6] ?? 0) + $amount;
            print_r($b);
            @$c->x[5] += $amount;
            print_r($c);
            $d[3] = (isset($d[3]) ? $d[3] : 0) + $amount;
            print_r($d);


            Output:



            Array ( [5] => 4 ) 
            Array ( [6] => 4 )
            stdClass Object (
            [x] => Array ( [5] => 4 )
            )
            Array ( [3] => 4 )


            Demo on 3v4l.org






            share|improve this answer


























            • Now that is nice

              – Siavas
              3 hours ago






            • 1





              The null coalescing example is great imho, but the first example can be really problematic when debugging. I'd never recommend using @. What if _costRemovedByLineItem is deleted, or is an object. The code will fail without any error in anything under 7.1: 3v4l.org/pvvrX

              – Devon
              3 hours ago













            • @Devon the failure in your demo occurs when _costRemovedByLineItem is an object, but if it is OPs code will also fail as they are trying to use it as an array too.

              – Nick
              3 hours ago














            5












            5








            5







            Something that will work in all versions of PHP:



            @$this->_costRemovedByLineItem[$objectId] += $amount;


            The @ (error control operator) will cause PHP to ignore the error caused by the non-existent index, create the element (with an empty value) and then add $amount to it, resulting in a value of $amount (as the empty value gets converted to 0 as a number).




            Warning use of the @ operator could potentially make it harder to debug
            your code, as it will hide error messages that you may have
            needed to see (for example, even if $this doesn't exist, or there is
            no object element called _costRemovedByLineItem, PHP will create
            them along with the array). See the third case in my example code.




            Alternatively in PHP7 you can use the Null Coalescing Operator:



            $this->_costRemovedByLineItem[$objectId] = ($this->_costRemovedByLineItem[$objectId] ?? 0) + $amount;


            And in PHP < 7 you can use the ternary operator



            $this->_costRemovedByLineItem[$objectId] = (isset($this->_costRemovedByLineItem[$objectId]) ? $this->_costRemovedByLineItem[$objectId] : 0) + $amount;


            A shorter example of each:



            $amount = 4;
            @$a[5] += $amount;
            print_r($a);
            $b[6] = ($b[6] ?? 0) + $amount;
            print_r($b);
            @$c->x[5] += $amount;
            print_r($c);
            $d[3] = (isset($d[3]) ? $d[3] : 0) + $amount;
            print_r($d);


            Output:



            Array ( [5] => 4 ) 
            Array ( [6] => 4 )
            stdClass Object (
            [x] => Array ( [5] => 4 )
            )
            Array ( [3] => 4 )


            Demo on 3v4l.org






            share|improve this answer















            Something that will work in all versions of PHP:



            @$this->_costRemovedByLineItem[$objectId] += $amount;


            The @ (error control operator) will cause PHP to ignore the error caused by the non-existent index, create the element (with an empty value) and then add $amount to it, resulting in a value of $amount (as the empty value gets converted to 0 as a number).




            Warning use of the @ operator could potentially make it harder to debug
            your code, as it will hide error messages that you may have
            needed to see (for example, even if $this doesn't exist, or there is
            no object element called _costRemovedByLineItem, PHP will create
            them along with the array). See the third case in my example code.




            Alternatively in PHP7 you can use the Null Coalescing Operator:



            $this->_costRemovedByLineItem[$objectId] = ($this->_costRemovedByLineItem[$objectId] ?? 0) + $amount;


            And in PHP < 7 you can use the ternary operator



            $this->_costRemovedByLineItem[$objectId] = (isset($this->_costRemovedByLineItem[$objectId]) ? $this->_costRemovedByLineItem[$objectId] : 0) + $amount;


            A shorter example of each:



            $amount = 4;
            @$a[5] += $amount;
            print_r($a);
            $b[6] = ($b[6] ?? 0) + $amount;
            print_r($b);
            @$c->x[5] += $amount;
            print_r($c);
            $d[3] = (isset($d[3]) ? $d[3] : 0) + $amount;
            print_r($d);


            Output:



            Array ( [5] => 4 ) 
            Array ( [6] => 4 )
            stdClass Object (
            [x] => Array ( [5] => 4 )
            )
            Array ( [3] => 4 )


            Demo on 3v4l.org







            share|improve this answer














            share|improve this answer



            share|improve this answer








            edited 36 mins ago

























            answered 3 hours ago









            NickNick

            27.3k111941




            27.3k111941













            • Now that is nice

              – Siavas
              3 hours ago






            • 1





              The null coalescing example is great imho, but the first example can be really problematic when debugging. I'd never recommend using @. What if _costRemovedByLineItem is deleted, or is an object. The code will fail without any error in anything under 7.1: 3v4l.org/pvvrX

              – Devon
              3 hours ago













            • @Devon the failure in your demo occurs when _costRemovedByLineItem is an object, but if it is OPs code will also fail as they are trying to use it as an array too.

              – Nick
              3 hours ago



















            • Now that is nice

              – Siavas
              3 hours ago






            • 1





              The null coalescing example is great imho, but the first example can be really problematic when debugging. I'd never recommend using @. What if _costRemovedByLineItem is deleted, or is an object. The code will fail without any error in anything under 7.1: 3v4l.org/pvvrX

              – Devon
              3 hours ago













            • @Devon the failure in your demo occurs when _costRemovedByLineItem is an object, but if it is OPs code will also fail as they are trying to use it as an array too.

              – Nick
              3 hours ago

















            Now that is nice

            – Siavas
            3 hours ago





            Now that is nice

            – Siavas
            3 hours ago




            1




            1





            The null coalescing example is great imho, but the first example can be really problematic when debugging. I'd never recommend using @. What if _costRemovedByLineItem is deleted, or is an object. The code will fail without any error in anything under 7.1: 3v4l.org/pvvrX

            – Devon
            3 hours ago







            The null coalescing example is great imho, but the first example can be really problematic when debugging. I'd never recommend using @. What if _costRemovedByLineItem is deleted, or is an object. The code will fail without any error in anything under 7.1: 3v4l.org/pvvrX

            – Devon
            3 hours ago















            @Devon the failure in your demo occurs when _costRemovedByLineItem is an object, but if it is OPs code will also fail as they are trying to use it as an array too.

            – Nick
            3 hours ago





            @Devon the failure in your demo occurs when _costRemovedByLineItem is an object, but if it is OPs code will also fail as they are trying to use it as an array too.

            – Nick
            3 hours ago











            0














            Ternary operators!



            $this->_costRemovedByLineItem[$objectId] = 
            (isset($this->_costRemovedByLineItem[$objectId])) ?
            $this->_costRemovedByLineItem[$objectId] + $amount :
            $amount;


            One sec... is this actually simpler?



            But maybe...



            $this->_costRemovedByLineItem[$objectId] = $this->_costRemovedByLineItem[$objectId] ?? 0;
            $this->_costRemovedByLineItem[$objectId] += $amount;


            This is for PHP 7+ only though. Or if you don't mind E_NOTICEs, from PHP 5.3:



            $this->_costRemovedByLineItem[$objectId] = $this->_costRemovedByLineItem[$objectId] ?: 0;
            $this->_costRemovedByLineItem[$objectId] += $amount;


            One sec... this we just make the code harder to understand with not much improved?






            share|improve this answer
























            • Yeah, I agree all the solutions are a little shorter, but I am not sure they improve readability much.

              – lukemh
              3 hours ago











            • Yep, this is what I was trying to say :)

              – Siavas
              3 hours ago
















            0














            Ternary operators!



            $this->_costRemovedByLineItem[$objectId] = 
            (isset($this->_costRemovedByLineItem[$objectId])) ?
            $this->_costRemovedByLineItem[$objectId] + $amount :
            $amount;


            One sec... is this actually simpler?



            But maybe...



            $this->_costRemovedByLineItem[$objectId] = $this->_costRemovedByLineItem[$objectId] ?? 0;
            $this->_costRemovedByLineItem[$objectId] += $amount;


            This is for PHP 7+ only though. Or if you don't mind E_NOTICEs, from PHP 5.3:



            $this->_costRemovedByLineItem[$objectId] = $this->_costRemovedByLineItem[$objectId] ?: 0;
            $this->_costRemovedByLineItem[$objectId] += $amount;


            One sec... this we just make the code harder to understand with not much improved?






            share|improve this answer
























            • Yeah, I agree all the solutions are a little shorter, but I am not sure they improve readability much.

              – lukemh
              3 hours ago











            • Yep, this is what I was trying to say :)

              – Siavas
              3 hours ago














            0












            0








            0







            Ternary operators!



            $this->_costRemovedByLineItem[$objectId] = 
            (isset($this->_costRemovedByLineItem[$objectId])) ?
            $this->_costRemovedByLineItem[$objectId] + $amount :
            $amount;


            One sec... is this actually simpler?



            But maybe...



            $this->_costRemovedByLineItem[$objectId] = $this->_costRemovedByLineItem[$objectId] ?? 0;
            $this->_costRemovedByLineItem[$objectId] += $amount;


            This is for PHP 7+ only though. Or if you don't mind E_NOTICEs, from PHP 5.3:



            $this->_costRemovedByLineItem[$objectId] = $this->_costRemovedByLineItem[$objectId] ?: 0;
            $this->_costRemovedByLineItem[$objectId] += $amount;


            One sec... this we just make the code harder to understand with not much improved?






            share|improve this answer













            Ternary operators!



            $this->_costRemovedByLineItem[$objectId] = 
            (isset($this->_costRemovedByLineItem[$objectId])) ?
            $this->_costRemovedByLineItem[$objectId] + $amount :
            $amount;


            One sec... is this actually simpler?



            But maybe...



            $this->_costRemovedByLineItem[$objectId] = $this->_costRemovedByLineItem[$objectId] ?? 0;
            $this->_costRemovedByLineItem[$objectId] += $amount;


            This is for PHP 7+ only though. Or if you don't mind E_NOTICEs, from PHP 5.3:



            $this->_costRemovedByLineItem[$objectId] = $this->_costRemovedByLineItem[$objectId] ?: 0;
            $this->_costRemovedByLineItem[$objectId] += $amount;


            One sec... this we just make the code harder to understand with not much improved?







            share|improve this answer












            share|improve this answer



            share|improve this answer










            answered 4 hours ago









            SiavasSiavas

            1,7161922




            1,7161922













            • Yeah, I agree all the solutions are a little shorter, but I am not sure they improve readability much.

              – lukemh
              3 hours ago











            • Yep, this is what I was trying to say :)

              – Siavas
              3 hours ago



















            • Yeah, I agree all the solutions are a little shorter, but I am not sure they improve readability much.

              – lukemh
              3 hours ago











            • Yep, this is what I was trying to say :)

              – Siavas
              3 hours ago

















            Yeah, I agree all the solutions are a little shorter, but I am not sure they improve readability much.

            – lukemh
            3 hours ago





            Yeah, I agree all the solutions are a little shorter, but I am not sure they improve readability much.

            – lukemh
            3 hours ago













            Yep, this is what I was trying to say :)

            – Siavas
            3 hours ago





            Yep, this is what I was trying to say :)

            – Siavas
            3 hours ago


















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