PHP，替换多个文件中的文本

需求：
    需要对两个目录中的文件内容进行查找替换，两个目录查找替换的内容不一样。
    实现中注意几点：
    （1）函数递归调用，来检索子目录；
    （2）函数名可以以参数形式传递；
    （3）用？进行非贪婪匹配；
    （4）每行匹配查找、整个文件内容匹配查找
<?php
//loopdir('dir1', 'repfile1');
loopdir('dir2', 'repfile2');
function loopdir($dir, $fun){
$dp = opendir($dir);
chdir($dir);
readdir($dp); //排除当前目录 "."
readdir($dp); //排除上层目录 "."
while( $v = readdir($dp) ){
if( is_dir($v) ) loopdir($v, $fun);
else $fun($v);
echo $v."<br>";
}
chdir("..");
}
function repfile1($filename){
$content = file_get_contents($filename);
if( empty($content) ){
echo "can't open file to read: ".$filename;
return ;
}

//加？号是进行非贪婪匹配，以免匹配的块太大
$content = preg_replace('/if \(!validateEmail\((.*?)"Email address is not valid(.*?})/s',
'if (!validateEmail(\\1"Email address is not valid\\2else if (!isNyhEmail(\\1"Can not add NYH email addresses.\\2',
$content);
writenewfile($filename, $content);
}
function repfile4615($filename){
$fpr = fopen($filename, 'r');
if( empty($fpr) ){
echo "can't open file to read: ".$filename;
return ;
}

$newContent = '';
while( $line = fgets($fpr) ){
$line = preg_replace('/^(.*)\$var_kitchen_dishwasher = "kitchen".\$kitchen_ind."_dishwasher";/s',
'\\1$var_kitchen_dishwasher = "kitchen".\$kitchen_ind."_dishwasher";
\\1$var_kitchen_oven = "kitchen".$kitchen_ind."_oven";
\\1$var_kitchen_fridge = "kitchen".$kitchen_ind."_fridge";', $line);
$newContent .= $line;
}
fclose($fpr);
writenewfile($filename, $newContent);
}
function writenewfile($filename, $content){
$fpw = fopen($filename, 'w');
if( empty($fpw) ){
echo "can't open file to write: ".$filename;
return ;
}
fwrite($fpw, $content);
fclose($fpw);
}
?>