Need help delete line from txt file

[newprogram]

I have a txt file about 100kb how would I delete a line for example

the text file look like

 

jkdslfsdf|dsfjhdsjkhfkds|fjhsdjkhfkjds

weruewu|dsifgsd|ewrtet

werioweuior|gdhfgh|wqerwqer

 

so if i want this line delete

"weruewu|dsifgsd|ewrtet"

 

 

 

 

 

 

[Alex]

$file = file('filename.txt');
$key = array_search('weruewu|dsifgsd|ewrtet', $file);
if($key)
     unset($file[$key]);
file_put_contents('filename.txt', implode("\n", $file));

 

file

array_search

unset

file_put_contents

[newprogram]

worked great thank you

$file = file('filename.txt');
$key = array_search('weruewu|dsifgsd|ewrtet', $file);
if($key)
     unset($file[$key]);
file_put_contents('filename.txt', implode("\n", $file));

 

file

array_search

unset

file_put_contents