PHP flow control statement_PHP tutorial

This article will talk about two kinds of process judgment statements in PHP, including switch statements and if else, if() statements. Let’s take a look at examples in detail.

代码如下	复制代码
switch(variable){ case value1: statement1; break; case value2: … default: defulat statement; }

The switch statement compares the value of the variable with the value in the case in turn. If they are not equal, continue to search for the next
case; if equal, execute the corresponding statement until the switch statement ends or break is encountered.

The code is as follows	Copy code
代码如下	复制代码
switch ($i) { case "apple": echo "i is apple"; break; case "bar": echo "i is bar"; break; case "cake": echo "i is cake"; break; } ?>

switch ($i) {

case "apple":

            echo "i is apple";

代码如下	复制代码
switch ($i) { case 0: echo "i equals 0"; break; case 1: echo "i equals 1"; break; case 2: echo "i equals 2"; break; } ?>

         break;

case "bar":
           echo "i is bar";

         break;

代码如下	复制代码
switch ($i) { case 0: case 1: case 2: echo "i is less than 3 but not negative"; break; case 3: echo "i is 3"; } ?>

case "cake":

            echo "i is cake";
         break;

}

代码如下	复制代码
if(expression1){ statement1; }else if(expression2){ statement2; } … else{ statementn; }

?> Example 2

The code is as follows	Copy code
switch ($i) {<🎜> case 0:<🎜>           echo "i equals 0";<🎜>          break;<🎜> Case 1:<🎜>            echo "i equals 1";<🎜>          break;<🎜> Case 2:<🎜>            echo "i equals 2";<🎜>          break;<🎜> }<🎜> ?>

Example 3

The code is as follows	Copy code
switch ($i) {<🎜> case 0:<🎜> case 1:<🎜> case 2:<🎜> echo "i is less than 3 but not negative";<🎜> Break;<🎜> case 3:<🎜> echo "i is 3";<🎜> }<🎜> ?>

The if...else statement can only choose two results: either true or false. But what should I do now that there are more than 2 choices Woolen cloth? At this time, you can use the esleif (can also be written as else if) statement to execute. The syntax format is:

The code is as follows	Copy code
if(expression1){ statement1; }else if(expression2){ statement2; } … else{ statementn; }

Example

代码如下	复制代码
$moth = date(“n”); $today = date(“j”); if($today >= 1and $today <= 10){ echo’今天是’.$moth.’月’.$today.’日上旬’; }elseif ($today >10 and $today <=20){ echo’今天是’.$moth.’月’.$today.’日中旬’; }else{ echo’今天是’.$moth.’月’.$today.’日下旬’； } ?>

If the current date is Friday, the following example will output "Have a nice weekend!", if it is Sunday, it will output "Have a nice Sunday!", otherwise it will output "Have a nice day!":

The code is as follows

代码如下	复制代码
$d=date("D"); if ($d=="Fri") echo "Have a nice weekend!"; elseif ($d=="Sun") echo "Have a nice Sunday!"; else echo "Have a nice day!"; ?>

Copy code

$d=date("D");
if ($d=="Fri")
echo "Have a nice weekend!";
elseif ($d=="Sun")
echo "Have a nice Sunday!";
else
echo "Have a nice day!";
?>

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http: //www.bkjia.com/PHPjc/629271.htmlTechArticleThis article will talk about two process judgment statements in PHP, including switch statement and if else, if() statement. Let’s take a look at an example in detail below. The code is as follows Copy code switch(variable){ ca...