PHP Knowledge 4

来源：互联网发布：短信群发系统源码编辑：程序博客网时间：2024/05/19 09:15

PHP中的数组的实质是键-值对（key-value pair）！

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<TITLE>获取数组中的元素</TITLE>

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$monthName = array(

/*定义$monthName[1]到$monthName[12]*/

1=>"January", "February", "March",

"April", "May", "June",

"July", "August", "September",

"October", "November", "December",

/*定义$monthName["Jan"]到$monthName["Dec"]*/

"Jan"=>"January", "Feb"=>"February",

"Mar"=>"March", "Apr"=>"April",

"May"=>"May", "Jun"=>"June",

"Jul"=>"July", "Aug"=>"August",

"Sep"=>"September", "Oct"=>"October",

"Nov"=>"November", "Dec"=>"December",

/*定义$monthName["Jan"]到$monthName["Dec"]*/

"January"=>"January", "February"=>"February",

"March"=>"March", "April"=>"April",

"May"=>"May", "June"=>"June",

"July"=>"July", "August"=>"August",

"September"=>"September", "October"=>"October",

"November"=>"November", "December"=>"December"

);

/*打印相关的元素*/

print("Month 5 is " . $monthName[5]. " /n");

print("Month Aug is " . $monthName["Aug"] . " /n");

print("Month June is " . $monthName["June"] . " /n");

print("Month NOTEXTST is " . $monthName["NOTEXTST"] . " /n"); //不存在的元素的值为空

print("Count for Array /$monthName is ".count($monthName));

//数组中元素的个数为35个，注意"May"=>"May"定义了重复的两次

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