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