PHP

1. Directly add a file link 🔒 Hidden content: Viewable after logging in <button> <a href= "http://localhost/down.zip" > Download File </button> 2. Pass parameters to search for and redirect to a download link: Passing parameters: <button> <a href...>

The `mysqli_num_rows()` function is exclusively used with `SELECT` query methods, whereas the `mysqli_affected_rows()` function returns the number of rows affected by the previous SQL statement across the entire database; this function is primarily used with `INSERT`, `UPDATE`, and `DELETE` operations.

Four commonly used methods for applying the `intval` integer conversion function in PHP: 1. Direct truncation – discards the fractional part and retains the integer: `intval()`; 2. Rounding – rounds the number to the nearest integer: `round()`; 3. Ceiling – rounds the number up by adding 1 if it has a fractional part: `ceil()`; 4. Floor – rounds the number down to the nearest integer: `floor()`. I. `intval` – Converts a variable to an integer type; if the argument is a string, it is automatically converted to 0. Example: `intval(3.14159);`...

Apply MD5 encryption to the timestamp and extract a portion of it: <?php function token($length){ $str = md5(time()); $token = substr($str, 5, $length); return $token;} echo token(6);?>

After retrieving the text content from the form's textarea input field, use the `explode(' rn', $str)对字符串内容进行分割, 发现rn,n,r都无法分割.使用PHP_EOL常量却正常分割成为数组.$arr = explode(PHP_EOL, $str);` function.

Solution 1: Use the urlencode and urldecode methods to bypass the header transformation process (headers: 'Content-Type: application/json; charset=utf-8'); $arr = array 'lang' => urlencode 'I speak Chinese'...

(For example, given the string "abcd", implement string reversal using PHP): 1. The first method utilizes PHP's built-in `strrev` function for easy implementation: `strrev($str);` 2. Alternatively, split the string into an array and then traverse and concatenate the characters: `function joinStrrev($str...)`

Definition and usage: The `file()` function reads an entire file into an array. Similar to `file_get_contents()`, the difference is that `file()` returns the file as an array. Each element in the array represents a corresponding line from the file, including the newline character. If the operation fails, it returns `false`. Syntax: `file(path, include_path, context...)`

PHP string functions are an integral part of PHP core. No installation is required to use these functions. Function Description addcslashes() Returns a string with a backslash added before the specified character. addslashes() returns a string with backslashes added before predefined characters. bin2hex() Converts a string of ASCII characters to a hexadecimal value. chop() deletes words…

PHP and HTML refresh the current page, which will be used many times, so record it! 🔒 Hidden content: You can view echo after logging in "&lt;script language=JavaScript&gt; location.replace(location.href);&lt;/script&gt;"; echo 'The server is busy, please&lt…