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Home/ Questions/Q 8958
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Alek Richter
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Alek RichterEnlightened
Asked: January 11, 20222022-01-11T11:02:43+00:00 2022-01-11T11:02:43+00:00

PHP: implode() Invalid arguments passed [closed]

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I am using Codeigniter and its validation rules – a custom callback validation. Anyway, this seems not to be CI related I think.

I’ve got this function to return a string …

function array_implode($a)
{
  return implode(',', $a);
}

… but I always get a message implode(): Invalid arguments passed

But var_dump() shows me this:

array(2) {
  [0]=> string(10) "First item"
  [1]=> string(11) "Second item"
}

What is wrong?

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  1. Alek Richter Enlightened
    2022-01-11T11:03:02+00:00Added an answer on January 11, 2022 at 11:03 am

    Why? Why would you write a function, that calls a std function? Why not write implode(‘,’, $array); instead of adding the overhead of a function call?

    Also: What var_dump puts out an array? is it a dump of $a inside the array_implode function? To be sure $a is always going to be an array, and you insist on keeping your array_implode function, edit the code to look like this:

    function array_implode(array $a)
    {//type hinting: this function will only work if $a is an array
    return implode(‘,’,$a);
    }

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