PHP 常用方法

• array_diff_assoc2

array_diff_assoc 在比对两个带key的数组时, 如果右边的数组没有对应的key, 左边对应的key是数组, 那没事, 不然就会转换左边的内容为字符串带来警告
function array_diff_assoc2($array, $array2)
{
    $d = [];
    foreach ($array as $key => $item) {
        if (array_key_exists($key, $array2)) {
            if (is_array($item)) {
                if (is_array($array2[$key])) {
                    if ($item != $array2[$key]) {
                        $d[$key] = $item;
                    }
                } else if (
                    (strpos($array2[$key], '[') === false 
                        && strpos($array2[$key], '{') === false)
                    || $item != json_decode($array2[$key], true)
                ) {
                    $d[$key] = $item;
                }
            } else if (is_array($array2[$key])) {
                if ($item != json_encode($array2[$key], 256)) {
                    $d[$key] = $item;
                }
            } else if ($item . '' != $array2[$key] . '') {
                $d[$key] = $item;
            }
        } else {
            $d[$key] = $item;
        }
    }
    return $d;
}

• json_encode [php特殊环境下无法使用该方法的过度办法]

function json_encodes($arr)
{
    $parts = array();
    $is_list = false;
    //Find out if the given array is a numerical array
    if (is_array($arr)) {
        $keys = array_keys($arr);
        $max_length = count($arr) - 1;
        if (
            !is_null($keys)
            && array_key_exists('0', $keys)
            && ($keys [0] === 0)
            && ($keys [$max_length] === $max_length)) { //See if the first key is 0 and last key is length - 1
            $is_list = true;
            for ($i = 0; $i < count($keys); $i++) { //See if each key correspondes to its position
                if ($i != $keys [$i]) { //A key fails at position check.
                    $is_list = false; //It is an associative array.
                    break;
                }
            }
        }
        foreach ($arr as $key => $value) {
            if (is_array($value)) { //Custom handling for arrays
                if ($is_list)
                    $parts [] = json_encodes($value); /* :RECURSION: */
                else
                    $parts [] = '"' . $key . '":' . json_encodes($value); /* :RECURSION: */
            } else {
                $str = '';
                if (!$is_list)
                    $str = '"' . $key . '":';
                //Custom handling for multiple data types
                if (is_numeric($value) && $value === $value * 1) {
                    $str .= $value;
                } elseif ($value === false)
                    $str .= 'false'; //The booleans
                elseif ($value === true)
                    $str .= 'true';
                elseif ($value === null)
                    $str .= 'null';
                else
                    $str .= '"' . addslashes($value) . '"'; //All other things
                // :TODO: Is there any more datatype we should be in the lookout for? (Object?)
                if (is_string($str)) {
                    $str = str_replace(PHP_EOL, '\r\n', $str);
                }
                $parts [] = $str;
            }
        }
    }

    $json = implode(',', $parts);
    if ($is_list)
        return '[' . $json . ']'; //Return numerical JSON
    return '{' . $json . '}'; //Return associative JSON
}