PHP数组转JSON字符串

在PHP中可以使用“json_encode()”函数将数组转为字符串，该函数用于把数组进行JSON编码，其语法是“json_encode(array)”，其参数array表示要转换数组，成功则返回JSON编码的字符串。

示例

<?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";?>

输出结果

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"}

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