Formatting php echo with null values

Question

Let's say I have a php array called $t with 5 elements in it. For demonstration purposes, let's call it $t = [a,b,c,d,e].

I want to echo all elements in parenthesis like this: (a, b, c, d, e). However, I want this parenthesis format to hold if there are null values in the array $t.

For example, if c and d are null in the array, it should echo (a, b, e). What's an efficient way of doing this without trying every possible permutation (impossible with large array sizes).

I have tried:

echo "("   
for($j=0; $j<5; $j++){
    if(!empty($t[j])){
        echo " $t[j], ";
    }
}
echo ")"

But this leaves a comma at the end, and even then I'm not sure if it accounts for every possible case. Thanks in advance!

This works. You just have to remove the trailing comma when you are done. Use rtrim() for that. — John Conde
– John Conde, Commented Apr 14, 2019 at 18:09

Bruno Leveque · Accepted Answer · 2019-04-14 21:25:08Z

2

This works pretty well:

<?php

function is_not_null($v) { return !is_null($v); }
$t = ['a', 'b', null, null, 'e'];
echo '('.implode(',', array_filter($t, 'is_not_null')).')';

Result:

(a,b,e)

answered Apr 14, 2019 at 21:25

Bruno Leveque

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