使用php删除文件中包含特定单词的行之前的所有行

Question

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

.

.

.

Answer 1

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