mbstring-audit.php

<?php

$functions = [
	'mail',
	'strlen',
	'strpos',
	'strrpos',
	'substr',
	'strtolower',
	'strtoupper',
	'stripos',
	'strripos',
	'strstr',
	'stristr',
	'strrchr',
	'substr_count',
];

foreach ($functions as $function) {
	$expression = '[^A-Za-z0-9_]' . $function . '\(';
	$matches = `ack -cl '$expression'`;
	$lines = explode("\n", $matches);
	$total = 0;
	foreach ($lines as $line) {
		$parts = explode(':', $line);
		$count = intval(end($parts));
		$total += $count;
	}
	echo str_pad($function, 12) . ' : ' . $total . "\n";
}