VECTOR COOL 威得數位行銷

PHP 5.2 才有支源 json_encode()

5.2以下會顯示下列錯誤

PHP Fatal error:  Call to undefined function json_encode()

可在PHP中加入下列function即可使用json_encode()

語法主要先檢查是否有json_encode這個function
如果沒有(php無支援)就使用下列function產生json格式字串

//PHP 5.1.x 不支援 json_encode()
if ( !function_exists(‘json_encode’) ){
function json_encode($data)
{
    if( is_array($data) || is_object($data) ) {
        $islist = is_array($data) && ( empty($data) || array_keys($data) === range(0,count($data)-1) );

        if( $islist ) {
            $json = ‘[‘ . implode(‘,’, array_map(‘json_encode’, $data) ) . ‘]’;
        } else {
            $items = Array();
            foreach( $data as $key => $value ) {
                $items[] = json_encode(“$key”) . ‘:’ . json_encode($value);
            }
            $json = ‘{‘ . implode(‘,’, $items) . ‘}’;
        }
    } elseif( is_string($data) ) {
        # Escape non-printable or Non-ASCII characters.
        # I also put the \ character first, as suggested in comments on the ‘addclashes’ page.
        $string = ‘”‘ . addcslashes($data, “\”nrt/” . chr(8) . chr(12)) . ‘”‘;
        $json    = ”;
        $len    = strlen($string);
        # Convert UTF-8 to Hexadecimal Codepoints.
        for( $i = 0; $i < $len; $i++ ) {

            $char = $string[$i];
            $c1 = ord($char);

            # Single byte;
            if( $c1 <128 ) {
                $json .= ($c1 > 31) ? $char : sprintf(“\u%04x”, $c1);
                continue;
            }

            # Double byte
            $c2 = ord($string[++$i]);
            if ( ($c1 & 32) === 0 ) {
                $json .= sprintf(“\u%04x”, ($c1 – 192) * 64 + $c2 – 128);
                continue;
            }

            # Triple
            $c3 = ord($string[++$i]);
            if( ($c1 & 16) === 0 ) {
                $json .= sprintf(“\u%04x”, (($c1 – 224) <<12) + (($c2 – 128) << 6) + ($c3 – 128));
                continue;
            }

            # Quadruple
            $c4 = ord($string[++$i]);
            if( ($c1 & 8 ) === 0 ) {
                $u = (($c1 & 15) << 2) + (($c2>>4) & 3) – 1;

                $w1 = (54<<10) + ($u<<6) + (($c2 & 15) << 2) + (($c3>>4) & 3);
                $w2 = (55<<10) + (($c3 & 15)<<6) + ($c4-128);
                $json .= sprintf(“\u%04x\u%04x”, $w1, $w2);
            }
        }
    } else {
        # int, floats, bools, null
        $json = strtolower(var_export( $data, true ));
    }
    return $json;
}
}[……]

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<?php
function formatNum($munber,$dot_num=0){
    return number_format($munber, $dot_num, ‘,’, ‘.’);
}
echo formatNum(‘123456789.876543’,2);
//結果 123,456,789.87
?>[……]

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session_unregister？session_unregister(‘var’);
You can use

unset($_SESSION['my_var']);

[……]

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$str = ‘測試字串’;
$fp = fopen(‘ftp://username:password@ftp.exmple.com/test.txt’,’w’);
fwrite($fp, $str);
fclose($fp);[……]

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