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<pre>

<?php 

function tryAlloc( $megabyte ){

    echo "try allocating {$megabyte} megabyte...";

    $dummy = str_repeat( "-",1048576 * $megabyte ) ;

    echo "pass.";

    echo " Usage: " . memory_get_usage( true ) / 1048576; 

    echo " Peak: " . memory_get_peak_usage( true ) / 1048576;

    echo "\n";

}   

for( $i=5; $i < 1000; $i += 5 ){

    tryAlloc( $i - 5 );

}

?>

</pre>