PHP如何将数组转换成JSON？
在PHP中可以通过使用函数“json_encode()”将数组转为JSON，该函数的作用是对变量进行JSON编码，函数语法为“json_encode($val)”，返回值为JSON编码的字符串。
使用示例
<?php$a = array('<foo>',"'bar'",'"baz"','&blong&', "xc3xa9");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($a, JSON_HEX_TAG | JSON_HEX_APOS | JSON_HEX_QUOT | JSON_HEX_AMP | JSON_UNESCAPED_UNICODE), "nn";$b = array();echo "Empty array output as array: ", json_encode($b), "n";echo "Empty array output as object: ", json_encode($b, JSON_FORCE_OBJECT), "nn";$c = array(array(1,2,3));echo "Non-associative array output as array: ", json_encode($c), "n";echo "Non-associative array output as object: ", json_encode($c, JSON_FORCE_OBJECT), "nn";$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), "nn";?>以上例程会输出：Normal: ["<foo>","'bar'",""baz"","&blong&","u00e9"]Tags: ["u003Cfoou003E","'bar'",""baz"","&blong&","u00e9"]Apos: ["<foo>","u0027baru0027",""baz"","&blong&","u00e9"]Quot: ["<foo>","'bar'","u0022bazu0022","&blong&","u00e9"]Amp: ["<foo>","'bar'",""baz"","u0026blongu0026","u00e9"]Unicode: ["<foo>","'bar'",""baz"","&blong&","é"]All: ["u003Cfoou003E","u0027baru0027","u0022bazu0022","u0026blongu0026","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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