Online PHP editor | vld for M94EH

<?php $datasets = array( // Returns (bool) false. 'an index containing the delimiter' => array( 'permalink_structure' => '/index.php', 'index' => 'index.php#', ), // Returns (int) 1. 'empty index' => array( 'permalink_structure' => '/index.php', 'index' => '', ), // Returns (int) 0. 'an array for index' => array( 'permalink_structure' => '/index.php', 'index' => array( 'index.php' ), ), // Produces a Fatal Error. // 'an object for index' => array( // 'permalink_structure' => '/index.php', // 'index' => (object) array( 'index.php' ), // ), '(int) -1 for index' => array( 'permalink_structure' => '/index.php', 'index' => -1, ), '(int) 0 for index' => array( 'permalink_structure' => '/index.php', 'index' => 0, ), '(int) 1 for index' => array( 'permalink_structure' => '/index.php', 'index' => 1, ), '(float) -1.0 for index' => array( 'permalink_structure' => '/index.php', 'index' => -1.0, ), '(float) 0.0 for index' => array( 'permalink_structure' => '/index.php', 'index' => 0.0, ), '(float) 1.0 for index' => array( 'permalink_structure' => '/index.php', 'index' => 1.0, ), '(bool) true for index' => array( 'permalink_structure' => '/index.php', 'index' => true, ), '(bool) false for index' => array( 'permalink_structure' => '/index.php', 'index' => true, ), // Produces a Fatal Error. // 'an array for permalink structure' => array( // 'permalink_structure' => array( '/index.php' ), // 'index' => 'index.php', // ), // Produces a Fatal Error. // 'an object for permalink structure' => array( // 'permalink_structure' => (object) array( '/index.php' ), // 'index' => 'index.php', // ), '(int) -1 for permalink structure' => array( 'permalink_structure' => -1, 'index' => 'index.php', ), '(int) 0 for permalink structure' => array( 'permalink_structure' => 0, 'index' => 'index.php', ), '(int) 1 for permalink structure' => array( 'permalink_structure' => 1, 'index' => 'index.php', ), '(float) -1.0 for permalink structure' => array( 'permalink_structure' => -1.0, 'index' => 'index.php', ), '(float) 0.0 for permalink structure' => array( 'permalink_structure' => 0.0, 'index' => 'index.php', ), '(float) 1.0 for permalink structure' => array( 'permalink_structure' => 1.0, 'index' => 'index.php', ), '(bool) true for permalink structure' => array( 'permalink_structure' => true, 'index' => 'index.php', ), '(bool) false for permalink structure' => array( 'permalink_structure' => false, 'index' => 'index.php', ), ); foreach ( $datasets as $name => $data ) { $result = preg_match( '#^/*' . $data['index'] . '#', $data['permalink_structure'] ); echo "preg_match() with $name: ", is_int( $result ) ? $result : 'false', "\n"; }