array解析

code

<?php
/**
 * Created by deshengkong.
 * Date: 14/12/23
 * Time: 下午8:07
 */

echo 'PHP version:'. phpversion() . PHP_EOL;

$arr2 = array(
    1 => 'giraffe',
    '2' => 'panda',
    9223372036854775806 => 'bird',
    '9223372036854775807' => 'deer',
    '9223372036854775808' => 'pig'
);

echo 'PHP_INT_MAX:' . PHP_INT_MAX . PHP_EOL;
var_dump($arr2);

result

PHP version:5.6.2
PHP_INT_MAX:9223372036854775807
array(5) {
  [1] =>
  string(7) "giraffe"
  [2] =>
  string(5) "panda"
  [9223372036854775806] =>
  string(4) "bird"
  [9223372036854775807] =>
  string(4) "deer"
  '9223372036854775808' =>
  string(3) "pig"
}

conclusion

在array中，類似 '12345'、'9894321'、'9223372036854775807'這種值作爲key時，

當其值小於 等於PHP_INT_MAX，都按numeric處理；

當其值大於PHP_INT_MAX，都按string處理；