php 几种编码 解码

1.json_encode和json_decode

<?php
$json = '{"a":1,"b":2,"c":3,"d":4,"e":5}';
var_dump(json_decode($json));
var_dump(json_decode($json, true));
?>

object(stdClass)#1 (5) {
    ["a"] => int(1)
    ["b"] => int(2)
    ["c"] => int(3)
    ["d"] => int(4)
    ["e"] => int(5)
}
array(5) {
    ["a"] => int(1)
    ["b"] => int(2)
    ["c"] => int(3)
    ["d"] => int(4)
    ["e"] => int(5)
}

2.base64_decode和base64_encode

　<?php
　　$str = 'VGhpcyBpcyBhbiBlbmNvZGVkIHN0cmluZw==';
　　echo base64_decode($str);
　　?>
　　此示例将显示：
　　This is an encoded string[1]