php数组长度的获取方法(三个实例)

<?php
$colorList = array("apple"=>"red","grass"=>"green","sky"=>"blue","night"=>"black","wall"=>"white"); 
 echo "Array size with count: ".count($colorList); 

<?php
$a=array('0'  =>  '123',  '1'  =>  'asdf');
$count  =  count($a);
$a_length  =  0; // www.jb200.com
for  ($i=0;  $i<$count;  $i++)  { 
  $a_length  =  $a_length  +  strlen($a[$i]); 
} 
print  $a_length; 
 

<?php
$a[0] = 1;
$a[1] = 3;
$a[2] = 5;
$result = count($a);
// $result == 3

$b[0] = 7;
$b[5] = 9;
$b[10] = 11;
$result = count($b);
// $result == 3;

$result = count(null);
// $result == 0

$result = count(false);
// $result == 1
?>