【PHP】怎样把数组写入文本文件？

方法一 - print_r()

使用print_r();

$data = ['key' => 111, 'key2' => 222, 'arr' => ['aaa', 'eee']];
$string = print_r($data, true);
file_put_contents('test.log', $string);

效果

方法二 - var_export()

使用 var_export();

$data = ['key' => 111, 'key2' => 222, 'arr' => ['aaa', 'eee']];
$string = var_export($data, true);
file_put_contents('test.log', $string);

效果

方法三 - json_encode()

使用 json_encode();

$data = ['key' => 111, 'key2' => 222, 'arr' => ['aaa', 'eee']];
$string = json_encode($data, true);
file_put_contents('test.log', $string);

效果
{“key”:111,“key2”:222,“arr”:[“aaa”,“eee”]}