PHP Basic Syntax Chapter 3 - Process Control_PHP Tutorial

one. Conditional statement

1.if statement syntax:

if (conditional statement 1) such as $a=$b or $a>$b

{

The command executed when conditional statement 1 is met, such as echo "a is greater than b";

}

elseif (conditional statement 2) For example $a

{

The command executed when conditional statement 2 is met, such as echo "because a or b is less than 0 and exceeds the optional range";

}

else does not need to be connected to a condition. The meaning of the branch is when neither conditional statement 1 nor conditional statement 2 is satisfied

{

Executed when neither conditional statement 1 nor conditional statement 2 is satisfied, such as echo "The content you entered is empty, please re-enter";

}

header("Content-Type:text/html; charset=utf-8"); $a=100; $b=10; if ($a>$b) { echo "a>b"; } elseif ($a Output result a>b

Example 2

header("Content-Type:text/html; charset=utf-8"); $secore=92; if($secore>=60 && $secore=70 && $secore=80 && $secore=90 && $secore100 || $secore Output results: Your grades are excellent

(2)switch statement syntax

switch (condition variable) for example: $a

{

The condition of the case condition variable. For example, $a>0: executed when the condition is met, such as echo a>0;break;

The condition of the case condition variable. For example, $a

default: output when none of the above conditions are met, such as echo "a and b are illegal";

}

header("Content-Type:text/html; charset=utf-8"); $secore=92; switch($secore) { case $secore>=60 && $secore=70 && $secore=80 && $secore=90 && $secore100: $pj="Yours The score is illegal";break; default: $pj="Your score is failing, keep working hard"; } echo $pj; ?> Output result: Your score is excellent

(3)Ternary operator syntax

echo (condition, for example: $a>$b)? If the condition is true statement "a>b": If the condition is not true "a

header("Content-Type:text/html; charset=utf-8"); $a=10;$b=20; echo ($a>$b)?"a>b" :"a 2. Flow control statement

Loop statement

1.for statement syntax

for ($variable name=0;$array name

{

echo $array name[$variable name];

}

header("Content-Type:text/html; charset=utf-8"); $a=array('Zhang Chao','Qiao Bin','Chen Wei','Zhao Yongfeng'); for ( $i=0;$i Output results Zhang Chao, Qiao Bin, Chen Wei, Zhao Yongfeng

2.while statement syntax

$Variable name=0

while($variable name

{

echo $array name[$variable name];

$Variable name++

}

header("Content-Type:text/html; charset=utf-8"); $a=array('Zhang Chao','Qiao Bin','Chen Wei','Zhao Yongfeng'); $i =0; while ($i Output results Zhang Chao, Qiao Bin, Chen Wei, Zhao Yongfeng

3.foreach loop syntax

foreach($variable name as $variable rename)

{

echo $variable rename;

}

header("Content-Type:text/html; charset=utf-8"); $a=array('Zhang Chao','Qiao Bin','Chen Wei','Zhao Yongfeng'); foreach ( $a as $v) { echo $v." "; } ?> Output results Zhang Chao, Qiao Bin, Chen Wei, Zhao Yongfeng

This article comes from the "PHP Study Notes" blog

http://www.bkjia.com/PHPjc/478713.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/478713.htmlTechArticleOne. Conditional statement 1. if statement syntax: if (conditional statement 1) such as $a=$b or $a$b { command executed when conditional statement 1 is met, such as echo a is greater than b; } elseif (conditional statement 2) for example $a...