PHP学习笔记（03）—— 控制结构-php教程-PHP中文网

PHP学习笔记（03）—— 控制结构

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发布： 2016-07-29 09:14:11

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控制结构

<code><span><span><?php</span><span>// ========break and c/span><span>for</span>(<span>$i</span> =<span>1</span>; <span>$i</span> < <span>10</span> ; <span>$i</span>++){
    <span>if</span>(<span>$i</span> == <span>4</span> ){
        <span>continue</span>;  <span>//跳过下一步，继续<strong>循环</strong></span>
    }
    <span>echo</span><span>$i</span>;
    <span>echo</span><span>"<br />"</span>;
}

<span>for</span>(<span>$i</span> =<span>1</span>; <span>$i</span> < <span>10</span> ; <span>$i</span>++){
    <span>if</span>(<span>$i</span> == <span>7</span>){
        <span>echo</span><span>$i</span>, <span>"真驸马"</span>;
        <span>break</span>;  <span>//已经找到需要的，跳出<strong>循环</strong></span>
    }
    <span>echo</span><span>$i</span>;
    <span>echo</span><span>"<br />"</span>;
}
<span>?></span></span></code>

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实际训练

过桥问题

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<code><span><span><?php</span>header(<span>"Content-Type: text/html; charset=utf-8"</span>);

<span>$a</span> = <span>0</span>;
<span>for</span> (<span>$i</span>=<span>100000</span>, <span>$cnt</span> = <span>0</span>; <span>$i</span> >= <span>5000</span> ;) { 
    <span>$cnt</span> += <span>1</span>;

    <span>//扣钱</span><span>if</span>(<span>$i</span> > <span>50000</span>){
        <span>$i</span> *= <span>0.95</span>;
    } <span>else</span> {
        <span>$i</span> -= <span>5000</span>;
    }

    <span>echo</span><span>'第'</span> , <span>$cnt</span> , <span>'次过桥，剩下'</span>, <span>$i</span> , <span>'元<br />'</span>;
}

<span>?></span></span></code>

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买鸡问题

<code><span>for</span> (<span>$x</span>=<span>1</span>; <span>$x</span>< <span>20</span>; <span>$x</span>++) { 
    <span>for</span> (<span>$y</span>=<span>1</span>; <span>$y</span> < <span>100</span> ; <span>$y</span>++) { 
        <span>$z</span> = <span>100</span> - <span>$x</span> - <span>$y</span>;
        <span>if</span> ((<span>$x</span>+<span>$y</span>+<span>$z</span>)==<span>100</span> && ( (<span>5</span>*<span>$x</span> + <span>3</span> * <span>$y</span>  + (<span>1</span>/ <span>3</span>) * <span>$z</span>) == <span>100</span>) ){
            <span>echo</span><span>'公鸡：'</span> ,<span>$x</span>, <span>'<br />'</span>;
            <span>echo</span><span>'母鸡：'</span>, <span>$y</span>, <span>'<br />'</span>;
            <span>echo</span><span>'小鸡：'</span> ,<span>$z</span>, <span>'<br />'</span>;
            }



        }
    }</code>

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以上就介绍了PHP学习笔记（03）—— 控制结构，包括了循环方面的内容，希望对PHP教程有兴趣的朋友有所帮助。