PHP 函数

字符串函数：

1     $name = "fakeface";
2     $myname =substr($name,0,3);//输出前面三个字符 fak
3     print $myname;
4     $name = strtoupper($name); //小写
5     print $name;
6     $name = strtolower($name);、、大写
7     print $name;
8     $position = strpos($name,"c");//输出c的位置
9     print $position;

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数学函数：

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

数组函数：

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