What are the latest security features for PHP functions?

PHP functions provide a wide range of security features, including functions for secure password hashing, secure random number generation, cross-site request forgery (CSRF) protection, SQL injection protection, and cross-site scripting (XSS) protection. For example, the password_hash() and password_verify() functions can be used to securely hash and verify passwords, and the mysqli_real_escape_string() function can be used to prevent SQL injection attacks.

Latest Security Features for PHP Functions

PHP provides a wide range of functions that help developers improve the security of their applications safety. Here are some of the latest security features included in PHP functions:

Password Hashing

PHP provides a series of functions for secure hashing and verification of passwords. These include:

• password_hash(): Generates a cryptographic password hash using a one-way hashing algorithm such as bcrypt.
• password_verify(): Compares the clear text password to the stored cryptographic hash to verify the user's identity.

Secure random number generation

PHP provides the following functions to generate secure random numbers:

• random_bytes() : Generate a secure, pseudo-random byte sequence.
• random_int(): Generate a safe random integer within the specified range.

Cross-site request forgery (CSRF) protection

PHP provides the following functions to mitigate CSRF attacks:

• csrf_token(): Generate anti-counterfeiting token.
• csrf_verify(): Verify anti-counterfeiting token.

SQL injection protection

PHP provides the following functions to prevent SQL injection attacks:

• mysqli_real_escape_string() : Escape the string to be included in the SQL query.
• PDO::quote(): Same as above.

XSS Protection

PHP provides the following functions to prevent cross-site scripting (XSS) attacks:

• htmlspecialchars(): Escape special characters into HTML entities.
• strip_tags(): Removes HTML and PHP tags from a string.

Practical Case: Secure Password Hashing

Let’s see how to use password_hash() and through an example password_verify() Function securely hashes and verifies passwords.

<?php
//  生成一个安全密码哈希
$password = 'my-secret-password';
$hash = password_hash($password, PASSWORD_BCRYPT);

//  验证密码
if (password_verify($password, $hash)) {
    echo "密码验证通过";
} else {
    echo "密码不匹配";
}
?>

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