- var_dump: documentation ( source)
- in_array: documentation ( source)
<?php
var_dump(
in_array(0, ['this', 'that', 1, 2])
);
var_dump(
in_array(null, ['this', 'that', 1, 2])
);
var_dump(
in_array('this', ['this', 'that', 1, 2])
);
var_dump(
in_array('there', ['this', 'that', 1, 2])
);