I am generating JSON with PHP.
我一直在用
$string = 'This string has "double quotes"';
echo addslashes($string);
outputs: This string has \" double quotes\"
Perfectly valid JSON
Unfortunately addslashes also escapes single quotes with catastrophic results for valid JSON
$string = "This string has 'single quotes'";
echo addslashes($string);
输出:This string has \'single quotes\'
简而言之，有没有办法只转义双引号？
虽然如果您可以使用json_encode，您应该使用json_encode，但您也可以使用addcslashes仅为某些字符添加\，例如:
addcslashes($str, '"\\/')
您还可以使用基于正则表达式的替换:
function json_string_encode($str) {
$callback = function($match) {
if ($match[0] === '\\') {
return $match[0];
} else {
$printable = array('"' => '"', '\\' => '\\', "\b" => 'b', "\f" => 'f', "\n" => 'n', "\r" => 'r', "\t" => 't');
return isset($printable[$match[0]])
? '\\'.$printable[$match[0]]
: '\\u'.strtoupper(current(unpack('H*', mb_convert_encoding($match[0], 'UCS-2BE', 'UTF-8'))));
}
};
return '"' . preg_replace_callback('/\\.|[^\x{20}-\x{21}\x{23}-\x{5B}\x{5D}-\x{10FFFF}/u', $callback, $str) . '"';
}