PHP 整理

一、数据类型

1. integer   ex:$intName1 = 12;
2. double   ex:$a=100.0235;
3. boolean  ex:$boolName1 = false;
4. string    ex:$tringName1 = "hello";

二、集合

1. array  ex:$array = array(1,2,3);
2. object ex:$a = new A();

三、流程

1. if   ex:
   

   <?php
   $foo = "xxx";
   if($foo == "xxx")
   {
       echo "==";
   }
   else
   {
       echo "!=";
   }
   ?>

2. while  ex:
   

   $i=1;
   while($i<=5)
   {
     echo "The number is " . $i . "<br />";
     $i++;
   }

3. do...while  ex:
   

   $i=1;
   do
   {
     echo "The number is " . $i . "<br />";
     $i++;
   }
   while($i<=5);

4. for
   

   for ($i=1; $i<=5; $i++)
   {
     echo "Hello World!<br />";
   }

5. foreach
   

   $arr=array("one", "two", "three");
   
   foreach ($arr as $value)
   {
     echo "Value: " . $value . "<br />";
   }