PHP flow control if statement

This article mainly introduces the if statement in PHP process control, which has certain reference value. Now I share it with everyone. Friends in need can refer to it

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The if structure is one of the most important features of many languages, including PHP, which allows code fragments to be executed conditionally. PHP's if structure is similar to the C language:

<?php
if (expr)
  statement
?>

If is greater than , the following example will show a is bigger than b:

<?php
if ($a > $b)
  echo "a is bigger than b";
?>

It is often necessary to execute more than one statement according to conditions , of course, there is no need to add an if clause to every statement. These statements can be placed into statement groups. For example, if is greater than , the following code will display a is bigger than b and assign the value of :

<?php
if ($a > $b) {
  echo "a is bigger than b";
  $b = $a;
}
?>

if statements can be nested infinitely deep within other if statements, which gives the program Provides full flexibility for conditional execution of different parts.

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