find an replace multiple items

I have a long list in a txt file such as

3434234
34234
eeewer
4rw4rrr
ytyyty
werwe
.
.
.

and what I want to do is find and delete the lines below, for example

34234
eeewer
4rw4rrr

how is this done?

 

error_reporting(E_ALL);

$file_array = file('/file.txt', FILE_USE_INCLUDE_PATH);

foreach($file_array as $k => $line) {
	
	$line = trim($line);
	
	if($line == '34234' or $line == 'eeewer' /*or $line == 'xxx' .............. */) {
		unset($file_array[$k]);
	}

}

$file_array = implode("", $file_array);

file_put_contents('/file.txt', $file_array, FILE_USE_INCLUDE_PATH);

PHP:

 

how about replacing 10 different lines? Would would you do? thanks

 

Just put the content of these unwanted lines into the if statment

  
[....]
if($line == 'text1' or $line == 'text2' or $line == 'text3' or $line == 'text3' or $line == 'text4' or $line == 'text5' or $line == 'text6' or $line == 'text7' or $line == 'text8' or $line == 'text9' or $line == 'text10' or $line == 'text12' or $line == 'text13' or $line == 'text14') {
      unset($file_array[$k]);
}
[.....]

PHP:

or a cleaner method if you have many words

error_reporting(E_ALL);

$file_array = file('/file.txt', FILE_USE_INCLUDE_PATH);

$unwanted = array(
	'word',
	'other word',
	'xxxxxx',
);

foreach($file_array as $k => $line) {
	
	$line = trim($line);
	
	if(in_array($line, $unwanted)) {
		unset($file_array[$k]);
	}

}

$file_array = implode("", $file_array);

file_put_contents('/file.txt', $file_array, FILE_USE_INCLUDE_PATH);

PHP:

 

seems clever.
What about if we want to find and replace some css or html tags in php or html files?

Like :
I want to find

and replace it with a different codes

 

$file = file_get_contents('file.css');
$file = str_replace('<div class="above_body">','<div class="above_footer">',$file)
file_put_contents('file.css',$file);

PHP: