PHP将分隔的字符串拆分为键/值对(关联数组)

$str = "key1=value1,key2=value2,key3=value3";
$pairs = explode(",", $str);
$result = array();
foreach ($pairs as $pair) {
    list($key, $value) = explode("=", $pair);
    $result[$key] = $value;
}
print_r($result);

$str = "key1=value1&key2=value2&key3=value3";
parse_str($str, $result);
print_r($result);

$str = "key1=value1;key2=value2;key3=value3";
$pairs = preg_split("/[=;]/", $str);
$result = array();
for ($i = 0; $i < count($pairs); $i += 2) {
    $key = $pairs[$i];
    $value = $pairs[$i + 1];
    $result[$key] = $value;
}
print_r($result);