我正在从数据库中读取一个字符串，json_encode不起作用。（使用PHP）
我需要用 '" 替换所有出现的 " ，但前提是该出现已经包含在 " 中。
示例字符串：
{"val1": "This is "some value" that is inside of the "string" and such", "val2": "And here is yet another "value" that is messed up by quotation marks", "val3": "etc. etc."}
应改为：
{"val1": "This is '"some value'" that is inside of the '"string'" and such", "val2": "And here is yet another '"value'" that is messed up by quotation marks", "val3": "etc. etc."}
试试这个指令：
首先将"替换为'"
并按照以下方式再次替换为正则表达式：
$a='{"val1": "This is "some value" that is inside of the "string" and such", "val2": "And here is yet another "value" that is messed up by quotation marks", "val3": "etc. etc."}';
var_dump($a);
$a=str_replace('"',''"',$a);
var_dump($a);
$re = "~('''''")([^'":]+)('''''"):''s*('''''")([^,]+)('''''")([,}])~m";
$str =$a;
$subst = "'"$2'": '"$5'"$7";
$a=preg_replace($re, $subst, $str);
var_dump($a);
现场演示
输出：
string '{"val1": "This is "some value" that is inside of the "string" and such", "val2": "And here is yet another "value" that is messed up by quotation marks", "val3": "etc. etc."}' (length=173)
string '{'"val1'": '"This is '"some value'" that is inside of the '"string'" and such'", '"val2'": '"And here is yet another '"value'" that is messed up by quotation marks'", '"val3'": '"etc. etc.'"}' (length=191)
string '{"val1": "This is '"some value'" that is inside of the '"string'" and such", "val2": "And here is yet another '"value'" that is messed up by quotation marks", "val3": "etc. etc."}' (length=179)