i want to delete first 5 lines in a text file

hello
iam new in php

i want to reed first 5 lines in text file

then i want to delete first 5 lines in a text file "1.txt"

i tried multi codes before

i want to make a iframe from first 5 lines in the text then delete them and update the file

<?php 
$myFile = "1.txt";
$lines = file($myFile);//file in to an array
 { 
print "<iframe width=300 height=260 src=" . $line[1] . "></iframe><br />\n"; 
print "<iframe width=300 height=260 src=" . $line[2] . "></iframe><br />\n"; 
print "<iframe width=300 height=260 src=" . $line[3] . "></iframe><br />\n"; 
 }

$File = "1.txt"; 
 $Handle = fopen($File, 'w');
delete($Handle, $lines[1]);
delete($Handle, $lines[2]);
delete($Handle, $lines[3]); 
 fclose($Handle); 

 ?>

Code (markup):

 

<?php
$myFile = "1.txt";
$lines = file($myFile);//file in to an array
print "<iframe width=300 height=260 src=" . $lines[0] . "></iframe><br />\n";
print "<iframe width=300 height=260 src=" . $lines[1] . "></iframe><br />\n";
print "<iframe width=300 height=260 src=" . $lines[2] . "></iframe><br />\n";
print "<iframe width=300 height=260 src=" . $lines[3] . "></iframe><br />\n";
print "<iframe width=300 height=260 src=" . $lines[4] . "></iframe><br />\n"; 

$i = 0;
$content = "";
do {    
    $content .= $lines[$i] . "\n";
} while ($i > 4);

$Handle = fopen($myFile, 'w');
fwrite($Handle, $content);
fclose($Handle); 
?>

PHP:

That should work for you.