How to Read, Write, and Modify INI Files in PHP?

Reading and Writing INI Files in PHP

Parse_ini_file is commonly used to read INI files in PHP. To read an INI file:

<code class="php">$ini_array = parse_ini_file("sample.ini");
print_r($ini_array);</code>

To access specific values:

<code class="php">echo $ini_array['lu_link'];
echo $ini_array['footerbg'];</code>

Writing back to the INI file requires a custom function:

<code class="php">function write_php_ini($array, $file)
{
    $res = [];
    foreach ($array as $key => $val) {
        if (is_array($val)) {
            $res[] = "[$key]";
            foreach ($val as $skey => $sval) {
                $res[] = "$skey = ".(is_numeric($sval) ? $sval : '"'.$sval.'"');
            }
        } else {
            $res[] = "$key = ".(is_numeric($val) ? $val : '"'.$val.'"');
        }
    }
    safefilerewrite($file, implode("\r\n", $res));
}</code>

Safefilerewrite ensures exclusive file access using flock:

<code class="php">function safefilerewrite($fileName, $dataToSave)
{
    if ($fp = fopen($fileName, 'w')) {
        $startTime = microtime(TRUE);
        do {
            $canWrite = flock($fp, LOCK_EX);
            if (!$canWrite) {
                usleep(round(rand(0, 100) * 1000));
            }
        } while ((!$canWrite) && ((microtime(TRUE) - $startTime) < 5));

        if ($canWrite) {
            fwrite($fp, $dataToSave);
            flock($fp, LOCK_UN);
        }
        fclose($fp);
    }
}</code>

Example Usage:

<code class="php">$ini_array = parse_ini_file("sample.ini");

$ini_array['lu_link'] = '#F00';
$ini_array['footerbg'] = '#FFF';

write_php_ini($ini_array, "sample.ini");</code>

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