What are the cases of php process control?

There are four PHP process control cases, namely: 1. if/else structure: to select different execution paths according to the results of conditional expressions; 2. switch structure: to perform different execution according to different conditions Branch processing; 3. for loop:, repeatedly execute the code block according to a fixed number of times or other counting conditions; 4. break/continue keyword: jump out of the current loop or continue to the next loop during the loop process.

Operating system for this tutorial: Windows 10 system, php8.1.3 version, Dell G3 computer.

php flow control examples include if/else judgment structures, switch statements, loop structures, and keywords.

The following is an example of a PHP flow control statement that demonstrates how to check the parity of a number based on user input:

<?php
  // 获取用户输入
  $input = $_POST[&#39;number&#39;];
  // 执行条件判断
  if (is_numeric($input)) {
    if ($input % 2 == 0) {
      echo "您输入的数字是偶数。";
    } else {
      echo "您输入的数字是奇数。";
    }
  } else {
    echo "请输入一个数字。";
  }
?>

In this example, first use $_POSTGet the number entered by the user. We then use the is_numeric() function to check if the number is a valid number. If it is, then use conditional statements if/else to check the parity of the number and output the appropriate message. If not, issue an error message to the user.

This example demonstrates two different types of flow control statements: conditional statements and error handling statements. With these statements, we can make our program take different actions based on specific conditions and handle errors or exceptions if needed.

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