1.json_decode() json_decode (php 5 >= 5.2.0, PECL json >= 1.2.0) json_decode — 對 JSON 格式的字符串進行編碼 說明 mixed json_decode ( string $json [, bool $assoc ] ) 接受一個 JSON 格式的字符串并且把它轉換為 PHP 變量 參數 json 待解碼的 json string 格式的字符串。 assoc 當該參數為 TRUE 時，將返回 array 而非 object 。 返回值 Returns an object or if the optional assoc parameter is TRUE, an associative array is instead returned. 范例 Example #1 json_decode() 的例子
復制代碼代碼如下:<?php $json = '{"a":1,"b":2,"c":3,"d":4,"e":5}'; var_dump(json_decode($json)); var_dump(json_decode($json, true)); ?> 上例將輸出： 復制代碼代碼如下:object(stdClass)#1 (5) { ["a"] => int(1) ["b"] => int(2) ["c"] => int(3) ["d"] => int(4) ["e"] => int(5) } array(5) { ["a"] => int(1) ["b"] => int(2) ["c"] => int(3) ["d"] => int(4) ["e"] => int(5) } 復制代碼代碼如下:$data='[{"Name":"a1","Number":"123","Contno":"000","QQNo":""},{"Name":"a1","Number":"123","Contno":"000","QQNo":""},{"Name":"a1","Number":"123","Contno":"000","QQNo":""}]'; echo json_decode($data); 結果為： 復制代碼代碼如下:Array ( [0] => stdClass Object ( [Name] => a1 [Number] => 123 [Contno] => 000 [QQNo] => ) [1] => stdClass Object ( [Name] => a1 [Number] => 123 [Contno] => 000 [QQNo] => ) [2] => stdClass Object ( [Name] => a1 [Number] => 123 [Contno] => 000 [QQNo] => ) ) 可以看出經過json_decode()編譯出來的是對象,現在輸出json_decode($data,true)試下 復制代碼代碼如下:echo json_decode($data,true); 結果： 復制代碼代碼如下:Array ( [0] => Array ( [Name] => a1 [Number] => 123 [Contno] => 000 [QQNo] => ) [1] => Array ( [Name] => a1 [Number] => 123 [Contno] => 000 [QQNo] => ) [2] => Array ( [Name] => a1 [Number] => 123 [Contno] => 000 [QQNo] => ) ) 可以看出 json_decode($data,true)輸出的一個關聯數組,由此可知json_decode($data）輸出的是對象,而json_decode("$arr",true)是把它強制生成PHP關聯數組. 2.json_encode() json_encode (PHP 5 >= 5.2.0, PECL json >= 1.2.0) json_encode — 對變量進行 JSON 編碼 Report a bug 說明 string json_encode ( mixed $value [, int $options = 0 ] ) 返回 value 值的 JSON 形式 Report a bug 參數 value 待編碼的 value ，除了resource 類型之外，可以為任何數據類型 該函數只能接受 UTF-8 編碼的數據 options 由以下常量組成的二進制掩碼： JSON_HEX_QUOT, JSON_HEX_TAG, JSON_HEX_AMP, JSON_HEX_APOS, JSON_NUMERIC_CHECK, JSON_PRETTY_PRINT, JSON_UNESCAPED_SLASHES, JSON_FORCE_OBJECT, JSON_UNESCAPED_UNICODE. Report a bug 返回值 編碼成功則返回一個以 JSON 形式表示的 string 或者在失敗時返回 FALSE 。 Report a bug 更新日志 版本 說明 5.4.0 options 參數增加常量： JSON_PRETTY_PRINT, JSON_UNESCAPED_SLASHES, 和 JSON_UNESCAPED_UNICODE。 5.3.3 options 參數增加常量：JSON_NUMERIC_CHECK。 5.3.0 增加 options 參數. Report a bug 范例 Example #1 A json_encode() 的例子 復制代碼代碼如下:<?php $arr = array ('a'=>1,'b'=>2,'c'=>3,'d'=>4,'e'=>5); echo json_encode($arr); ?> 以上例程會輸出： 復制代碼代碼如下:{"a":1,"b":2,"c":3,"d":4,"e":5} Example #2 json_encode() 函數中 options 參數的用法 復制代碼代碼如下:<?php $a = array('<foo>',"'bar'",'"baz"','&blong&', "/xc3/xa9"); echo "Normal: ", json_encode($a), "/n"; echo "Tags: ", json_encode($a, JSON_HEX_TAG), "/n"; echo "Apos: ", json_encode($a, JSON_HEX_APOS), "/n"; echo "Quot: ", json_encode($a, JSON_HEX_QUOT), "/n"; echo "Amp: ", json_encode($a, JSON_HEX_AMP), "/n"; echo "Unicode: ", json_encode($a, JSON_UNESCAPED_UNICODE), "/n"; echo "All: ", json_encode($a, JSON_HEX_TAG | JSON_HEX_APOS | JSON_HEX_QUOT | JSON_HEX_AMP | JSON_UNESCAPED_UNICODE), "/n/n"; $b = array(); echo "Empty array output as array: ", json_encode($b), "/n"; echo "Empty array output as object: ", json_encode($b, JSON_FORCE_OBJECT), "/n/n"; $c = array(array(1,2,3)); echo "Non-associative array output as array: ", json_encode($c), "/n"; echo "Non-associative array output as object: ", json_encode($c, JSON_FORCE_OBJECT), "/n/n"; $d = array('foo' => 'bar', 'baz' => 'long'); echo "Associative array always output as object: ", json_encode($d), "/n"; echo "Associative array always output as object: ", json_encode($d, JSON_FORCE_OBJECT), "/n/n"; ?> 以上例程會輸出： 復制代碼代碼如下:Normal: ["<foo>","'bar'","/"baz/"","&blong&","/u00e9"] Tags: ["/u003Cfoo/u003E","'bar'","/"baz/"","&blong&","/u00e9"] Apos: ["<foo>","/u0027bar/u0027","/"baz/"","&blong&","/u00e9"] Quot: ["<foo>","'bar'","/u0022baz/u0022","&blong&","/u00e9"] Amp: ["<foo>","'bar'","/"baz/"","/u0026blong/u0026","/u00e9"] Unicode: ["<foo>","'bar'","/"baz/"","&blong&","é"] All: ["/u003Cfoo/u003E","/u0027bar/u0027","/u0022baz/u0022","/u0026blong/u0026","é"] Empty array output as array: [] Empty array output as object: {} Non-associative array output as array: [[1,2,3]] Non-associative array output as object: {"0":{"0":1,"1":2,"2":3}} Associative array always output as object: {"foo":"bar","baz":"long"} Associative array always output as object: {"foo":"bar","baz":"long"} Example #3 連續與非連續數組示例 復制代碼代碼如下:<?php echo "連續數組".PHP_EOL; $sequential = array("foo", "bar", "baz", "blong"); var_dump( $sequential, json_encode($sequential) ); echo PHP_EOL."非連續數組".PHP_EOL; $nonsequential = array(1=>"foo", 2=>"bar", 3=>"baz", 4=>"blong"); var_dump( $nonsequential, json_encode($nonsequential) ); echo PHP_EOL."刪除一個連續數組值的方式產生的非連續數組".PHP_EOL; unset($sequential[1]); var_dump( $sequential, json_encode($sequential) ); ?> 以上例程會輸出： 復制代碼代碼如下:連續數組 array(4) { [0]=> string(3) "foo" [1]=> string(3) "bar" [2]=> string(3) "baz" [3]=> string(5) "blong" } string(27) "["foo","bar","baz","blong"]" 非連續數組 array(4) { [1]=> string(3) "foo" [2]=> string(3) "bar" [3]=> string(3) "baz" [4]=> string(5) "blong" } string(43) "{"1":"foo","2":"bar","3":"baz","4":"blong"}" 刪除一個連續數組值的方式產生的非連續數組 array(3) { [0]=> string(3) "foo" [2]=> string(3) "baz" [3]=> string(5) "blong" } string(33) "{"0":"foo","2":"baz","3":"blong"}" 復制代碼代碼如下:$obj->Name= 'a1';$obj->Number ='123'; $obj->Contno= '000'; echo json_encode($obj); 結果為： 復制代碼代碼如下:{"Name":"a1", "Number":"123", "Contno":"000" } 可以看出json_encode()和json_decode()是編譯和反編譯過程，注意json只接受utf-8編碼的字符，所以json_encode()的參數必須是utf-8編碼，否則會得到空字符或者null。新聞熱點
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