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In PHP, what are the drawbacks of dynamically evaluating expressions using the `eval()` function?

Using the `eval()` function in PHP can pose security risks as it allows for the execution of arbitrary code, making the application vulnerable to code...

How can the explode function in PHP be used to manipulate time data effectively?

When working with time data in PHP, the explode function can be used to split a string into an array based on a specified delimiter. This can be helpf...

What are the potential reasons for the session_start() function not working in PHP 5?

The session_start() function may not work in PHP 5 due to incorrect session.save_path configuration, disabled session support, or headers already sent...

How can an email sender be specified in PHP when using the mail() function?

When using the mail() function in PHP to send emails, the sender can be specified by adding additional headers to the email. The "From" header can be...

What is the function rawurlencode() used for in PHP when dealing with URL variables?

When dealing with URL variables in PHP, it is important to properly encode special characters to ensure the data is transmitted correctly. The rawurle...