- var_dump: documentation ( source)
- array_flip: documentation ( source)
- in_array: documentation ( source)
<?php
$a = array(1,2,3,4,5);
function arrayFlip($a) {
$b = array_flip($a);
var_dump(isset($a[1]));
}
function inArray($a) {
var_dump(in_array(1,$a));
}
inArray($a);