- var_dump: documentation ( source)
- array_search: documentation ( source)
- in_array: documentation ( source)
<?php
$list = array( 'foo', 'bar', 0, 'qux' );
var_dump( $list );
$var = 'julio';
var_dump( in_array( $var, $list ) );
var_dump( in_array( 'julio', $list ) );
var_dump( array_search( $var, $list ) );