PHP 函数

字符串函数：

　　

= "fakeface" =(,0,3); = (); = ( = (,"c"); ; View Code

数学函数：

　　

<span 1</span>     <span $num</span> = 123.123456<span ;
</span><span 2</span>     <span print</span> <span round</span>(<span $num</span>);<span //</span><span 输出一个整数123</span>
<span 3</span>    <span print</span> <span round</span>(<span $num</span>,3);<span //</span><span 输出数字并保留三位小数123.123</span>
<span 4</span>     <span rand</span>(1,10);<span //</span><span 在1,10随机生成一个数字</span>

数组函数：

　　

<span  1</span>     <span $fav_bands</span> = <span array</span><span ();
</span><span  2</span>     <span array_push</span>(<span $fav_bands</span>, "Maroon 5");<span //</span><span 给数组添加元素</span>
<span  3</span>     <span array_push</span>(<span $fav_bands</span>, "Bruno Mars"<span );
</span><span  4</span>     <span array_push</span>(<span $fav_bands</span>, "Nickelback"<span );
</span><span  5</span>     <span array_push</span>(<span $fav_bands</span>, "Katy Perry"<span );
</span><span  6</span>     <span array_push</span>(<span $fav_bands</span>, "Macklemore"<span );
</span><span  7</span>     <span print</span> <span count</span>(<span $fav_bands</span><span ); 查看数组有多少元素
</span><span  8</span> 
<span  9</span> 
<span 10</span>    <span $names</span> = <span array</span>("david","alana","violet","rory"<span );
</span><span 11</span>     <span sort</span>(<span $names</span>);<span //</span><span  array("alana","david","rory","violet")</span>
<span 12</span>     <span print</span> <span join</span>(", ", <span $names</span>);<span //</span><span  prints alana, david, rory, violet</span>
<span 13</span>     <span rsort</span>(<span $names</span>);  <span //</span><span  array("violet","rory","david","alana")</span>