是否有一个 PHP 函数只在双引号中添加斜杠而不是单引号
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Is there a PHP function that only adds slashes to double quotes NOT single quotes
提问by Tim
I am generating JSON with PHP.
我正在用 PHP 生成 JSON。
I have been using
我一直在使用
$string = 'This string has "double quotes"';
echo addslashes($string);
outputs: This string has \" double quotes\"
输出： This string has \" double quotes\"
Perfectly valid JSON
完全有效的 JSON
Unfortunately addslashes also escapes single quotes with catastrophic results for valid JSON
不幸的是，对于有效的 JSON，addslashes 也会转义单引号，并产生灾难性的结果
$string = "This string has 'single quotes'";
echo addslashes($string);
outputs: This string has \'single quotes\'
输出： This string has \'single quotes\'
In short, is there a way to only escape double quotes?
简而言之，有没有办法只转义双引号？
回答by Gumbo
Although you should use json_encodeif it's available to you, you could also use addcslashesto add \only to certain characters like:
尽管您应该使用json_encode它，如果它对您可用，您也可以使用仅addcslashes添加\到某些字符，例如：
addcslashes($str, '"\/')
You could also use a regular expression based replacement:
您还可以使用基于正则表达式的替换：
function json_string_encode($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, $str) . '"';
}
回答by hakre
Is there a PHP function that only adds slashes to double quotes NOT single quotes
是否有一个 PHP 函数只在双引号中添加斜杠而不是单引号
There is no function like addslashes()that only adds a slash to double quotes.
没有这样的函数addslashes()只在双引号中添加斜杠。
However you can make use of addcslashes()to only add slashes to specific characters, e.g. onlyto double quotes:
但是，您可以使用addcslashes()仅向特定字符添加斜杠，例如仅添加到双引号：
addcslashes($string, '"');
That does exactly as described. If you want to have it compatible with stripcslashes()however, you need to add the slash itself to the list of chars:
这与描述的完全一样。stripcslashes()但是，如果要使其兼容，则需要将斜杠本身添加到字符列表中：
addcslashes($string, '"\');
That should do the job you've been asking for. I have no idea if that is compatible with json encoding.
那应该可以完成您一直要求的工作。我不知道这是否与 json 编码兼容。
回答by Pascal MARTIN
If you are generating JSON, why not just use the json_encode()function ?
如果您正在生成 JSON，为什么不直接使用该json_encode()函数？
回答by Ryan Sutana
function json_string_encode( $str ) {
$from = array('"'); // Array of values to replace
$to = array('\"'); // Array of values to replace with
// Replace the string passed
return str_replace( $from, $to, $str );
}
To use the function you simply need to use
要使用该功能，您只需使用
$text = json_string_encode($text);
