count(var)是用来统计数组或对象的元素个数的

<?php
//count_classObject.php
$l=strlen("http://php.net");
echo $l , '<br>';
echo count($l) , '<br>'; 

class Foo { 
    public $aMemberVar = 'aMemberVar Member Variable'; 
    public $aFuncName = 'aMemberFunc'; 
    
    
    function aMemberFunc() { 
        print 'Inside `aMemberFunc()`' . '<br>'; 
    }
} 

$foo = new Foo; 
echo count($foo) , '<br>'; 
var_dump($foo);
?> 

14
1
1

object(Foo)[1]
  public 'aMemberVar' => 

string

 'aMemberVar Member Variable' (length=26)
  public 'aFuncName' => 

string

 'aMemberFunc' (length=11)