Complete PHP function library

The PHP function library provides a wide range of tools for completing a variety of programming tasks, including string manipulation, array manipulation, and interaction with databases. These functions help write PHP applications efficiently. In addition, this article also shows a practical case of using the PHP function library to dynamically generate HTML tables, which can obtain data from the database and display it in the table.

PHP Function Library: A Comprehensive Guide

PHP provides an extensive library of functions to solve a wide range of programming problems Tasks, from string manipulation to database interaction. Understanding the purpose and usage of these functions is crucial to writing PHP applications efficiently.

String function

• strlen():Returns the length of the string.
• strtoupper():Convert the string to uppercase.
• strtolower():Convert the string to lowercase.
• substr():Extract a substring from a string.
• str_replace():Replace another string in a string with a new string.

Array function

• sort():Sort the array.
• count():Returns the number of elements in the array.
• array_merge():Merge two or more arrays.
• array_keys():Returns an array of all keys of the array.
• in_array():Check whether a value exists in the array.

Date and time functions

• date():Format the given date and time.
• time():Returns the current timestamp.
• mktime():Creates a timestamp from the specified date and time.
• strtotime():Convert the date and time represented by a string into a timestamp.
• gmdate():Date-time formatted as Greenwich Mean Time (GMT).

Database functions

• mysqli_connect():Establish a connection to the MySQL database.
• mysqli_query():Execute a SQL query.
• mysqli_fetch_assoc():Get an associative array from the result set.
• mysqli_num_rows():Returns the number of rows in the result set.
• mysqli_close():Close the connection to the MySQL database.

Practical case: Dynamically generate HTML table

"; echo "ID姓名电子邮件"; // 遍历结果集并生成表行 while ($row = mysqli_fetch_assoc($result)) { echo "" . $row['id'] . "" . $row['name'] . "" . $row['email'] . ""; } // 关闭数据库连接 mysqli_close($mysqli); echo ""; ?>

The above script connects to the database, executes a query, and then dynamically generates an HTML table containing the query results.

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