: 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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I hope I can spend more than three days in a week.Blog WritingRight.
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.