Online PHP editor | output for fNRDq

@ 2013-12-13T01:41:31Z

<?php
call_user_func(function(){
    echo 'val_val' . PHP_EOL;

    $a = range(1, 100000);
    $m  = memory_get_usage();
    $b = $a;
    $c = $b;

    echo '  memory usage: ' . number_format(memory_get_usage() - $m) . PHP_EOL;
});

call_user_func(function(){
    echo 'ref_val' . PHP_EOL;

    $a = range(1, 100000);
    $m  = memory_get_usage();
    $b = &$a;
    $c = $b;

    echo '  memory usage: ' . number_format(memory_get_usage() - $m) . PHP_EOL;
});

call_user_func(function(){
    echo 'val_ref' . PHP_EOL;

    $a = range(1, 100000);
    $m  = memory_get_usage();
    $b = $a;
    $c = &$b;

    echo '  memory usage: ' . number_format(memory_get_usage() - $m) . PHP_EOL;
});

call_user_func(function(){
    echo 'ref_ref' . PHP_EOL;

    $a = range(1, 100000);
    $m  = memory_get_usage();
    $b = &$a;
    $c = &$b;

    echo '  memory usage: ' . number_format(memory_get_usage() - $m) . PHP_EOL;
});

Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.7, 7.2.0: val_val memory usage: 0 ref_val memory usage: 24 val_ref memory usage: 24 ref_ref memory usage: 24
Output for 5.3.1 - 5.3.29, 5.5.0 - 5.5.38, 5.6.0 - 5.6.28: val_val memory usage: 48 ref_val memory usage: 9,848,776 val_ref memory usage: 9,848,776 ref_ref memory usage: 48
Output for 5.3.0, 5.4.0 - 5.4.45: val_val memory usage: 48 ref_val memory usage: 9,848,800 val_ref memory usage: 9,848,800 ref_ref memory usage: 48
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17: Parse error: syntax error, unexpected T_FUNCTION, expecting ')' in /in/fNRDq on line 2
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, 5.0.0 - 5.0.5: Parse error: parse error, unexpected T_FUNCTION, expecting ')' in /in/fNRDq on line 2
Process exited with code 255.
Output for 4.3.2 - 4.3.4: Parse error: parse error, expecting `')'' in /in/fNRDq on line 2
Process exited with code 255.

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