Delete all lines before a line that included specific word in a file by using php

I need a simple code in php that can delete all lines before a line that included a specific word, for example this is contents of foo.txt:

.

.

eroigjeoj

dvjdofgj

dsfdsft

reytyjkjm

.

.

[DATA]

1,2,4

3,4,5

.

.

.

I want to delete all lines before line that included "[DATA]" and delete that line too. and the result be a foo.txt with this content:

1,2,4

3,4,5

.

.

.

Solution

Here is one approach, maybe not the most efficient.

Create a new text file (text2).
```
$text2 = fopen("text2", "w");
```
Initialise a boolean value to false.
```
$hitWord = false;
```

Read through original text file (text1) line by line until you hit the String '[DATA]', adding the subsequent lines to text2

$handle = fopen("text1.txt", "r");
if ($handle) {
   while (($line = fgets($handle)) !== false) {
       if($hitWord){
           fwrite($text2, $line . "\n");
       }else{
           if(strpos($line,'[DATA]') !== false){
               $hitWord = true;
           }
       }
   }
   fclose($handle);
} else {
// error opening the file.
}

Delete text1 using unlink($text1) // you will need path
Rename text2 to text1 using rename() function.

ALTERNATIVELY

You could use the same approach above. Except instead of editing a new text file, edit a new String and just replace all the lines in text1 with this string at the end of the program.

This would save you having to create/delete/edit new files. Make sure new line is used correctly