Ajax Submit Base64 image encoding, PHP server side receive not

$.ajax ({
URL: $ ("#hdImage"). attr ("value"),
Type: "POST",
DataType: ' Text ',
Data: {"ImageData": Rst.base64},
Success:function (Result) {
}
});


PHP Receive:
$base 64_string = $_post[' ImageData '); The value obtained is NULL

But if the JS end of the data: {"ImageData": rst.base64} modified to data: {"ImageData": 1234},php is able to receive data, what is this situation, thank you!

Reply to discussion (solution)

Rst.base64 No value

Rst.base64 No value

This value, when I use Firefox debugging, there are a lot of values passed

Find the reason, in fact, the value is obtained, but I through Xdebug+phpstom debugging time, phpstorm over a certain length of variable, monitoring will not work

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