Chapter 5_PHP Process Control_PHP Tutorial-PHP Tutorial-php.cn

Chapter 5_PHP Process Control_PHP Tutorial

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Release： 2016-07-13 17:17:25

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1. Sequential structure

　2. Branch structure

　2.1 if...else

<span 1</span> <?<span php
</span><span 2</span>     <span $today</span>=<span date</span>("w");   <span //</span><span 获取今天星期几</span>
<span 3</span>     <span if</span>(<span $today</span>==0<span ){
</span><span 4</span>         <span echo</span> 'Sunday!'<span ;
</span><span 5</span>     }<span else</span><span {
</span><span 6</span>         <span echo</span> 'Sorry!'<span ;
</span><span 7</span> <span     }
</span><span 8</span> ?>

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　2.2 if...elseif

　2.3 switch

　3. Loop structure

　3.1 while

<span 1</span> <?<span php
</span><span 2</span>     <span $num</span>=1<span ;
</span><span 3</span>     <span while</span>(<span $num</span><=100<span ){
</span><span 4</span>         <span echo</span> <span $num</span>.' '<span ;
</span><span 5</span>         <span $num</span>++<span ;
</span><span 6</span> <span     }
</span><span 7</span> ?>

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　3.2 do...while

Similar to C/C++

　3.3 for

<span 1</span> <?<span php
</span><span 2</span>     <span $week</span>=<span array</span>('Sunday','Monday','Tuesday','Wednesday','Thursday','Friday','Saturday'<span );
</span><span 3</span>     <span $size</span>=<span count</span>(<span $week</span><span );
</span><span 4</span>     <span echo</span> '数组大小'.<span $size</span>.'<p>'<span ;
</span><span 5</span>     <span for</span>(<span $i</span>=0;<span $i</span><<span $size</span>;<span $i</span>++<span ){
</span><span 6</span>         <span echo</span> <span $week</span>[<span $i</span>].' '<span ;
</span><span 7</span> <span     }
</span><span 8</span> ?>

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　3.4 foreach

The foreach statement is specially used to traverse arrays. There are two syntax formats:

　　①foreach(array name as element name){

Statement block;

　　　}

　　②foreach(array name as key name => element name){

Statement block;

　　　}

An example of the former is as follows:

<span 1</span> <?<span php
</span><span 2</span>     <span $week</span>=<span array</span>('Sunday','Monday','Tuesday','Wednesday','Thursday','Friday','Saturday'<span );
</span><span 3</span>     <span $size</span>=<span count</span>(<span $week</span><span );
</span><span 4</span>     <span echo</span> '数组大小'.<span $size</span>.'<p>'<span ;
</span><span 5</span>     <span foreach</span>(<span $week</span> <span as</span> <span $value</span><span ){
</span><span 6</span>         <span echo</span> <span $value</span>.' '<span ;
</span><span 7</span> <span     }
</span><span 8</span> ?>

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An example of the latter is as follows:

<span 1</span> <?<span php
</span><span 2</span>     <span $week</span>=<span array</span>('星期日'=>'Sunday','星期一'=>'Monday','星期二'=>'Tuesday','星期三'=>'Wednesday','星期四'=>'Thursday','星期五'=>'Friday','星期六'=>'Saturday'<span );
</span><span 3</span>     <span $size</span>=<span count</span>(<span $week</span><span );
</span><span 4</span>     <span echo</span> '数组大小'.<span $size</span>.'<p>'<span ;
</span><span 5</span>     <span foreach</span>(<span $week</span> <span as</span> <span $key</span>=><span $value</span><span ){
</span><span 6</span>         <span echo</span> <span $key</span>.':'.<span $value</span>.' '<span ;
</span><span 7</span> <span     }
</span><span 8</span> ?>

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　4.break and continue

A number can be followed by break to indicate which loop to jump out of, and a number can also be followed after continue to indicate which unexecuted statement after the loop to be jumped out of.