CODEWITHSUNDEEP
phpfile-writing
caaax
caaax

Reputation: 460

Search a file for a string and replace everything after a character in that line

I am looking to use PHP to open a file (see example below), search it line by line for a string $colour and replace everything after the = with $value.

file.txt before:

red=0
green=23
blue=999
yellow=44

If my $value is "1" and my colour is "blue", my file should change to:

red=0
green=23
blue=1
yellow=44

My code so far is:

function write($colour, $value) {
    $file = 'path';
    $file_contents = file_get_contents($file);
    $file_contents = str_replace($colour, $value, $file_contents);
    file_put_contents($file, $file_contents);
}

However this only gets as far as replacing the $colour with the $value (not everything after the "=") see below my output:

red=0
green=23
1=999
yellow=44

How do I do this?

Upvotes: 0

Views: 281

Answers (2)

blahy
blahy

Reputation: 1319

This happens because your code only replaces color with value specified. To do this you would have to load file line by line, explode by = to have color and value separetely, adjust and store again. Or use regexes.

I would like to propose different approach. Instead on operating on file loaded as string, load file as array. There is a function for this: parse_ini_file.

<?php

// load the file to array with elements key => value
$data = parse_ini_file('conf.txt');

var_dump($data);

// change the data in array however you want - here i add 1 to red everytime this script is called, but it can be whatever: $data['red'] = 2; or similar
$data['red']++;

// now just build the contents of the file again and save it
$contents = '';
foreach ($data as $key => $value) {
  $contents .= $key.'='.$value.PHP_EOL;
}

file_put_contents('conf.txt', $contents);

Result:

// this is how the file looks like at start
cat conf.txt 
red=0
green=23
blue=1
yellow=44

// this is how $data looks
array(4) {
  ["red"]=>
  string(1) "0"
  ["green"]=>
  string(2) "23"
  ["blue"]=>
  string(1) "1"
  ["yellow"]=>
  string(2) "44"
}

// and the file after the execution
cat conf.txt 
red=1
green=23
blue=1
yellow=44

Change $data['red']++; to $data[$color] = $value; put it into a function and thats it.

Upvotes: 1

Nigel Ren
Nigel Ren

Reputation: 57121

The problem is that you are just replacing the text of the colour with the value in

$file_contents = str_replace($colour, $value, $file_contents);

this doesn't replace the full line though.

Using preg_replace(), you can replace something starting with the colour followed by and = till the end of line with...

$file_contents = preg_replace("/{$colour}=.*/", "{$colour}={$value}", $file_contents);

Upvotes: 1

Related Questions