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PHP code:

<?php
function insertContent($source, $s, $iLine, $index) {
$file_handle = fopen($source, "r");
$i = 0;
$arr = array();
while (!feof($file_handle)) {

$line = fgets($file_handle);
++$i;
if ($i == $iLine) {
if($index == strlen($line)-1)
$arr[] = substr($line, 0, strlen($line)-1) . $s . "\n";
else
$arr[] = substr($line, 0, $index) . $s . substr($line, $index);
}else {

$arr[] = $line;
}
}
fclose($file_handle);
return $arr;
}
$arrInsert = insertContent("array.php", "abcdef", 3, 10);
unlink("array.php");
foreach($arrInsert as $value)
file_put_contents("array.php", $value, FILE_APPEND);
?>
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