JuniorTheoryCommon

What does the program print?

PHP

<?php

$days = ['mon', 'tue', 'wed'];
$pos = array_search('mon', $days);
if ($pos) {
    echo 'found at ', $pos;
} else {
    echo 'missing';
}
echo ' ', $pos === false ? 'no' : 'yes', "\n";

missing yes

Expecting if ($pos) to catch a found element: a match under key 0 returns 0, which is false in a condition, so test $pos !== false instead.
Expecting array_search to return true or a position counted from 1: it returns the element's key, and the first key of a list is 0.

How would you rewrite the condition so that it works for the first element too?
What does array_search return when the value is not in the array?

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JuniorTheoryCommon

What does the program print?

PHP

<?php

$days = ['mon', 'tue', 'wed'];
$pos = array_search('mon', $days);
if ($pos) {
    echo 'found at ', $pos;
} else {
    echo 'missing';
}
echo ' ', $pos === false ? 'no' : 'yes', "\n";

missing yes

Expecting if ($pos) to catch a found element: a match under key 0 returns 0, which is false in a condition, so test $pos !== false instead.
Expecting array_search to return true or a position counted from 1: it returns the element's key, and the first key of a list is 0.

How would you rewrite the condition so that it works for the first element too?
What does array_search return when the value is not in the array?

Back to questions Open topic in roadmap →Answer it yourself — Quiz