PHP syntax 3: control structure For loop/If/Switch/While

: This article mainly introduces PHP syntax 3: control structure For loop IfSwitchWhile. if you are interested in PHP tutorials, refer to it. Related links:

PHP syntax(1): Basics and variables

PHP syntax(2): data types, operators, and functions

PHP syntax(3): control structure (For loop/If/Switch/While)

In this article, I will summarize several common control structures in PHP. first, I will give you the most special foreach. The remaining control structures are similar to those in other languages, so this phase will be relatively simple.

Foreach loop

Traverses each element in the array and loops through the code block.

Usage:foreach ( $array as $value )

Every iteration of an array, the value of the current array element is assigned to the $ value variable, and the array pointer is moved one by one until it reaches the last array element.

    $age=array("Bill"=>"35","Steve"=>"37","Peter"=>"43");    foreach($age as $x=>$x_value) {      echo "Key=" . $x . ", Value=" . $x_value;    }

For loop

The basic for loop is as follows:

For ($ x = 0; $ x <= 10; $ x ++) {echo "number: $ x ";}

If judgment

If has no special usage.

If (condition) {code executed when the condition is true;} elseif (condition) {code executed when the condition is true;} else {code executed when the condition is false ;}

Switch

Switch is similar to C ++.

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

While

While (condition true) {code to be executed ;}

Do while

Do... while loop first executes a code block and then checks the condition. if the specified condition is true, it repeats the loop.

Do {code to be executed;} while (the condition is true );

Last

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The above introduces PHP syntax 3: control structure For loop/If/Switch/While, including blog writing and PHP syntax content, if you are interested in PHP tutorials.