1.顺序结构
2.分支结构
2.1 if...else
<span> <?<span php><span> <span>=<span date>("w"); <span><span>
<span> <span if>(<span>==0<span><span> <span echo> 'Sunday!'<span><span> }<span else><span><span> <span echo> 'Sorry!'<span><span> <span><span> ?></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>2.2 if...elseif
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2.3 switch
3.循环结构
3.1 while
<span> <?<span php><span> <span>=1<span><span> <span while>(<span><=100<span><span> <span echo> <span>.' '<span><span> <span>++<span><span> <span><span> ?></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>
3.2 do...while
与C/C++类似
3.3 for
<span> <?<span php><span> <span>=<span array>('Sunday','Monday','Tuesday','Wednesday','Thursday','Friday','Saturday'<span><span> <span>=<span count>(<span><span><span> <span echo> '数组大小'.<span>.'<p>'<span><span> <span for>(<span>=0;<span><<span>;<span>++<span><span> <span echo> <span>[<span>].' '<span><span> <span><span> ?></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>3.4 foreach
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foreach语句专门用来遍历数组的，有两种语法格式：
①foreach(数组名 as 元素名){
语句块;
}
②foreach(数组名 as 键名 => 元素名){
语句块;
}
前者举例如下：
<span> <?<span php><span> <span>=<span array>('Sunday','Monday','Tuesday','Wednesday','Thursday','Friday','Saturday'<span><span> <span>=<span count>(<span><span><span> <span echo> '数组大小'.<span>.'<p>'<span><span> <span foreach>(<span> <span as> <span><span><span> <span echo> <span>.' '<span><span> <span><span> ?></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>后者举例如下：
<span> <?<span php><span> <span>=<span array>('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>=<span count>(<span><span><span> <span echo> '数组大小'.<span>.'<p>'<span><span> <span foreach>(<span> <span as> <span>=><span><span><span> <span echo> <span>.':'.<span>.' '<span><span> <span><span> ?></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>4.break 与 continue
break后面可以接一个数字，表示跳出第几重循环，continue后面也可以接一个数字，表示跳出第几重循环后面尚未执行的语句。
