Detailed explanation of if usage in php

Detailed explanation of if usage in php

When you write code, you often want to perform different actions for different decisions . You can do this using conditional statements in your code.

In PHP, we can use the following conditional statements:

1.if statement - If the specified condition is true, the code is executed

2.if...else Statement - If the condition is true, execute the code; if the condition is false, execute the other end of the code

3.if...elseif....else Statement - Select one of several code blocks to execute

4.switch statement - statement one of multiple code blocks to execute

if (条件) {
  当条件为 true 时执行的代码;
}

if (条件) {
  条件为 true 时执行的代码;
} else {
  条件为 false 时执行的代码;
}

if (条件) {
  条件为 true 时执行的代码;
} elseif (condition) {
  条件为 true 时执行的代码;
} else {
  条件为 false 时执行的代码;
}

<?php
switch ($x)
{
case 1:
  echo "Number 1";
  break;
case 2:
  echo "Number 2";
  break;
case 3:
  echo "Number 3";
  break;
default:
  echo "No number between 1 and 3";
}
?>

Recommended tutorial: "php tutorial"

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