Search results for: "word blacklist"

What is the difference between using a blacklist and a whitelist approach for validating input in PHP?

When validating input in PHP, using a blacklist approach involves specifying what values or characters are not allowed, while a whitelist approach inv...

Is it more effective to use a whitelist or a blacklist approach for restricting characters in usernames in PHP?

Using a whitelist approach is generally more effective for restricting characters in usernames in PHP. This means allowing only certain characters to...

What is the best way to link a specific word within a PHP variable without affecting other occurrences of the word?

When linking a specific word within a PHP variable, you can use the `str_replace()` function to replace only the exact word you want to link without a...

What potential problem arises when trying to highlight a specific word like "xml" within a larger word like "simplexml" in PHP code?

When trying to highlight a specific word like "xml" within a larger word like "simplexml" in PHP code, the issue arises because using simple string ma...

How can PHP be used to implement a temporary IP blacklist for users who exceed a certain number of login attempts?

To implement a temporary IP blacklist for users who exceed a certain number of login attempts, we can use PHP to track the number of failed login atte...