PhpWarning: strstr () [function. strstr]: Emptydelimiter_PHP tutorial

PhpWarning: strstr () [function. strstr]: Emptydelimiter. When using the strstr function in php today, the following error message is displayed: Warning: strstr () [function. strstr]: Emptydelimiter. later, the solution is found repeatedly. if you need it, you can refer to it. Wa prompts Warning: strstr () [function. strstr]: Empty delimiter is incorrect. later, the solution is found repeatedly. if you need it, refer to it.

Warning: strstr () [function. strstr]: Empty delimiter

Strange: Is there a problem with a parameter in strstr of the php function?

So I wrote a test example.

The code is as follows:
$ Text = "asdfghjklqwertyuiopzxcvbnm "; // $ Key = "g "; // According to the php error prompt Empty delimiter, it is determined that the value of $ text should not have a problem, so the key value is intentionally commented If (strstr ($ text, $ key )){ Echo "found it "; } Else { Echo "not found "; } ?>

Strstr () does not return an error. Therefore, the $ key value may be an empty string "". just try again.

Sure enough, when strstr ($ text, "") is displayed, the error Warning: strstr () [function. strstr]: Empty delimiter is prompted.

Failed () [function. strstr]: Empty delimiter is incorrect. later, the solution is found repeatedly. if you need it, you can refer to it. Wa...