update-env-file.php

<?php

if ($argc < 5) {
	echo <<<EOF
	Use:
	php modify.php <filename> <variable> <from> <to> <backup>

EOF;
	exit(1);
}

function find_line($lines, $needle) {
	foreach ($lines as $index => $line) {
		if (stripos($line, $needle) !== false) {
			return $index;
		}
	}

	return false;
}

$file = $argv[1];
$variable = $argv[2];
$from = $argv[3];
$to = $argv[4];
$backup = isset($argv[5]) ? true : false;

$content = file_get_contents($file);
$search_env_var = "{$variable}={$from}";

if (stripos($content, $search_env_var) !== false) {

	$lines = explode("\n", $content);
	$line_num = find_line($lines, "{$variable}=");

	$new_lines = [];

	if ($backup) {
		$new_lines []= "#{$variable}={$from}";
	}
	$new_lines []= "{$variable}={$to}";

	$offset = $line_num;

	$result = array_slice($lines, 0, $offset);

	foreach ($new_lines as $new_line) {
		$result []= $new_line;
	}

	$offset++;

	for ($i = $offset; $i<count($lines); $i++) {
		$result []= $lines[$i];
	}

	echo "Replacing lines of {$file}\n";

	file_put_contents($file, implode("\n", $result));
} else {
	echo "Not found in {$file}\n";
}