PHP Benchmark: Modifying Arrays in Loop vs By Reference

The performance differences between modifying arrays in a loop versus modifying them by reference in PHP. This comprehensive benchmark analysis helps developers choose the best approach for optimal performance and code efficiency.

PHP Code Editor

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<?php
$a = array();
for ($i = 0; $i < 10000; $i++) {
    $a[] = $i;
}
$start = microtime(true);
foreach ($a as $k => $v) {
    $a[$k] = $v + 1;
}
echo "Completed in ", microtime(true) - $start, " Seconds\n";
$start = microtime(true);
foreach ($a as $k => &$v) {
    $v = $v + 1;
}
echo "Completed in ", microtime(true) - $start, " Seconds\n";
$start = microtime(true);
foreach ($a as $k => $v) {}
echo "Completed in ", microtime(true) - $start, " Seconds\n";
$start = microtime(true);
foreach ($a as $k => &$v) {}    
 
 
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Execution Result

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