php索引数组和关联数组
在PHP中数组有两种形式，索引数组和关联数组索引数组：用整数做下标，默认从0开始，后面依次加一关联数组：用字符串做下标，通过=>符号将下标和值关联起来<?php//1、索引数组的声明
$stu=array('tom','berry','ketty'); //索引数组
print_r($stu); //输出数组Array ( => tom => berry => ketty )
echo '<hr>';
echo $stu,'<br>'; //tom
echo $stu,'<br>'; //berry
echo $stu,'<hr>'; //ketty
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//2、关联数组
$emp=array('name'=>'李白','sex'=>'男','age'=>22);
print_r($emp); //Array ( => 李白 => 男 => 22 )
echo '<hr>';
echo $emp['name'],'<br>'; //李白
echo $emp['sex'],'<br>'; //男
echo $emp['age']; //22练习：写出数组的下标
$array=array(1=>'a','b','c','d');
print_r($array); //Array ( => a => b => c => d )
echo '<br>';
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$array=array('a',2=>'b','c',5=>'d');
print_r($array);//Array ( => a => b => c => d )
echo '<br>';
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$array=array('a','name'=>'b','c','sex'=>'d');
print_r($array); //Array ( => a => b => c => d )
echo '<br>';
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$array=array(1=>'a',1=>'b',1=>'c','d');
print_r($array); //Array ( => c => d )
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