Test memory usage in PHP

memory-test.php

<?php

function get_formatted_memory_peak( $bytes, $precision = 2 ) {
	$units  = array( 'b', 'kb', 'mb', 'gb', 'tb' );
	$bytes  = max( $bytes, 0 );
	$pow    = floor( ( $bytes ? log( $bytes ) : 0 ) / log( 1024 ) );
	$pow    = min( $pow, count( $units ) - 1 );
	$bytes /= ( 1 << ( 10 * $pow ) );

	return round( $bytes, $precision ) . ' ' . $units[ $pow ];
}

$mem_before = memory_get_peak_usage();
// Some code here to test
$mem_after = memory_get_peak_usage();

error_log( get_formatted_memory_peak( $mem_after - $mem_before ) ); //@codingStandardsIgnoreLine