Online PHP editor | output for 1SGGd

@ 2025-05-21T14:23:03Z

<?php

function byref( &$arg ) {
    $arg = 'abc';
}

function bar($a) {
    $x = new Exception();
    $trace = $x->getTrace();
    
    foreach ( $trace as $frame ) {
        if ( empty( $frame['args'] ) ) {
              continue;
        }
        
        foreach ( $frame['args'] as $key => $arg ) {
            if ( is_array( $arg ) ) {
                // array_walk_recursive( $arg, 'byref' );
                // same issue when doing it manually:
                foreach ( $arg as &$foo ) {
                    $foo = 'xyz';
                }
                unset( $foo );
            }
        }
    }
}

$b = array( 'X', 'Y' );
foreach ( $b as &$value ) {
    bar( $b );
    var_dump( $value );
}

Output for 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.34, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.32, 8.2.0 - 8.2.29, 8.3.0 - 8.3.27, 8.4.1 - 8.4.14: string(3) "xyz" string(3) "xyz"
Output for 4.4.2 - 4.4.9: Parse error: syntax error, unexpected '&', expecting T_VARIABLE or '$' in /in/1SGGd on line 20
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1: Parse error: parse error, unexpected '&', expecting T_VARIABLE or '$' in /in/1SGGd on line 20
Process exited with code 255.
Output for 4.3.2 - 4.3.4: Parse error: parse error, expecting `T_VARIABLE' or `'$'' in /in/1SGGd on line 20
Process exited with code 255.

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