php 全文搜索和替换的实现代码

<?php
exec("/bin/grep -r '$oldword' $rootpath", $results, $errorCode);
if ($errorCode){
if ($errorCode == 1){
echo "Possibly no files were found with ?$oldword in them
\n";
}
echo "OS Error: $errorCode
\n";
echo "Check 'man errno' and count down
\n";
echo "Usually paths/permissions
\n";
}
while (list(,$path) = each($results)){
$parts = explode(':', $path);
$path = $parts[0];
$fp = fopen($path, 'r') or print("Cannot read $path
\n");
if ($fp){
$data = fread($fp, filesize($path));
fclose($fp);
$newdata = str_replace($oldword, $newword, $data);
$fp = fopen($path, 'w') or print("Cannot write $path
\n");
if ($fp){
fwrite($fp, $newdata);
fclose($fp);
echo $path, "
\n";
}
}
}
?>