<?php
 
// -------------------------------------
// test file generator
 
$filename = 'test.txt';
$pattern = '--' . "\r\n";
$count_lines = 100000; //100k
 
for ($i=0; $i < $count_lines; $i++) { 
	$lines[] = $pattern;
}
 
file_put_contents($filename, $lines);
 
 
// -------------------------------------
// comparison script
 
$pattern = "\r\n";
$new_pattern = '<br>';
$lines = file('test.txt');
 
$str_start = xdebug_time_index();
foreach ($lines as $line) {
	$str_lines[] = str_replace($pattern, $new_pattern, $line);
}
$str_end = xdebug_time_index();
 
$preg_start = xdebug_time_index();
foreach ($lines as $line) {
	$preg_lines[] = preg_replace("#{$pattern}#", $new_pattern, $line);
}
$preg_end = xdebug_time_index();
 
echo ('str_replace time = ' . round($str_end - $str_start, 5));
echo '<br>';
echo ('preg_replace time = ' . round(($preg_end - $preg_start), 5));
 
file_put_contents('str.txt', $str_lines);
file_put_contents('preg.txt', $preg_lines);

PD9waHAKCi8vIC0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0KLy8gdGVzdCBmaWxlIGdlbmVyYXRvcgoKJGZpbGVuYW1lID0gJ3Rlc3QudHh0JzsKJHBhdHRlcm4gPSAnLS0nIC4gIlxyXG4iOwokY291bnRfbGluZXMgPSAxMDAwMDA7IC8vMTAwawoKZm9yICgkaT0wOyAkaSA8ICRjb3VudF9saW5lczsgJGkrKykgeyAKCSRsaW5lc1tdID0gJHBhdHRlcm47Cn0KCmZpbGVfcHV0X2NvbnRlbnRzKCRmaWxlbmFtZSwgJGxpbmVzKTsKCgovLyAtLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tCi8vIGNvbXBhcmlzb24gc2NyaXB0CgokcGF0dGVybiA9ICJcclxuIjsKJG5ld19wYXR0ZXJuID0gJzxicj4nOwokbGluZXMgPSBmaWxlKCd0ZXN0LnR4dCcpOwoKJHN0cl9zdGFydCA9IHhkZWJ1Z190aW1lX2luZGV4KCk7CmZvcmVhY2ggKCRsaW5lcyBhcyAkbGluZSkgewoJJHN0cl9saW5lc1tdID0gc3RyX3JlcGxhY2UoJHBhdHRlcm4sICRuZXdfcGF0dGVybiwgJGxpbmUpOwp9CiRzdHJfZW5kID0geGRlYnVnX3RpbWVfaW5kZXgoKTsKCiRwcmVnX3N0YXJ0ID0geGRlYnVnX3RpbWVfaW5kZXgoKTsKZm9yZWFjaCAoJGxpbmVzIGFzICRsaW5lKSB7CgkkcHJlZ19saW5lc1tdID0gcHJlZ19yZXBsYWNlKCIjeyRwYXR0ZXJufSMiLCAkbmV3X3BhdHRlcm4sICRsaW5lKTsKfQokcHJlZ19lbmQgPSB4ZGVidWdfdGltZV9pbmRleCgpOwoKZWNobyAoJ3N0cl9yZXBsYWNlIHRpbWUgPSAnIC4gcm91bmQoJHN0cl9lbmQgLSAkc3RyX3N0YXJ0LCA1KSk7CmVjaG8gJzxicj4nOwplY2hvICgncHJlZ19yZXBsYWNlIHRpbWUgPSAnIC4gcm91bmQoKCRwcmVnX2VuZCAtICRwcmVnX3N0YXJ0KSwgNSkpOwoKZmlsZV9wdXRfY29udGVudHMoJ3N0ci50eHQnLCAkc3RyX2xpbmVzKTsKZmlsZV9wdXRfY29udGVudHMoJ3ByZWcudHh0JywgJHByZWdfbGluZXMpOw==