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Q:

array_shift : Only variables should be passed by reference error in php

Hey everyone,

I'm facing an issue with the `array_shift` function in PHP and I'm hoping someone here can help me out. Whenever I try to use the `array_shift` function, I get an error saying "Only variables should be passed by reference". I'm not sure what this means or how to fix it.

To provide some context, I'm working on a project where I need to remove the first element from an array. I tried using `array_shift` as it seemed like the appropriate function for the job. Here's the code I'm using:

```php
$myArray = [1, 2, 3, 4, 5];
array_shift($myArray);
```

But when I run this code, I encounter the error "Only variables should be passed by reference". I'm not sure why this is happening as I'm passing a variable `$myArray` to the function.

I've tried searching online for a solution, but I haven't been able to find a clear explanation or a fix for this problem. Can someone please explain why I'm getting this error and how to resolve it? I would really appreciate any guidance or suggestions. Thank you in advance!

All Replies

janis20

Hey,

I actually encountered this exact issue a while back, so I can definitely help you out! The "Only variables should be passed by reference" error in PHP is quite common when using the `array_shift` function.

In my case, the error occurred because I was inadvertently using an expression rather than a variable as the argument for `array_shift`. Make sure that the argument you're passing is a variable that holds the array you want to modify.

Here's an example of how I fixed it in my code:

php
$myArray = [1, 2, 3, 4, 5];
$tempArray = $myArray; // Copy the array to a temporary variable
array_shift($tempArray); // Use the temporary array as the argument


By creating a temporary variable and passing that to `array_shift`, rather than `array_shift($myArray)` directly, I was able to resolve the error.

Give this approach a try and see if it resolves the issue for you. Let me know if you have any other questions or need further clarification!

casimer06

Hey there!

I've encountered this error before when using the `array_shift` function in PHP. The "Only variables should be passed by reference" error typically occurs when you try to pass an expression or a constant value to `array_shift` instead of a variable.

In your code, it seems like you are declaring the array directly as `[1, 2, 3, 4, 5]`. Try assigning it to a variable first, like this:

php
$myArray = [1, 2, 3, 4, 5];
array_shift($myArray);


If you're still receiving the same error, please double-check that you don't have any typos or syntax errors in the code surrounding the `array_shift` line. Sometimes a misplaced bracket or semicolon in a previous line can cause unexpected behavior.

I hope this helps! Let me know if you have any further questions.

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