PHP full text search and replace implementation code_PHP tutorial

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"; 
} 
} 
} 
?> 

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