(PHP 4, PHP 5, PHP 7)
define — 锟斤拷锟斤拷一锟斤拷锟斤拷锟斤拷
锟斤拷锟斤拷锟斤拷时锟斤拷锟斤拷一锟斤拷锟斤拷锟斤拷锟斤拷
name锟斤拷锟斤拷锟斤拷锟斤拷
value
锟斤拷锟斤拷锟斤拷值锟斤拷锟斤拷 PHP 5 锟叫ｏ拷value 锟斤拷锟斤拷锟角憋拷锟斤拷( integer锟斤拷
float锟斤拷string锟斤拷boolean锟斤拷NULL锟斤拷锟斤拷 PHP 7 锟叫伙拷锟斤拷锟斤拷锟角革拷 array 锟斤拷值锟斤拷
锟斤拷锟斤拷锟斤拷锟斤拷锟皆讹拷锟斤拷为 resource 锟斤拷锟酵ｏ拷锟斤拷锟斤拷锟斤拷锟狡硷拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷为锟斤拷锟杰伙拷锟叫诧拷锟斤拷预知锟斤拷锟斤拷为锟斤拷锟斤拷锟斤拷
case_insensitive
锟斤拷锟斤拷锟斤拷锟轿� TRUE锟斤拷锟矫筹拷锟斤拷锟斤拷锟叫⌒达拷锟斤拷锟斤拷小锟侥拷锟斤拷谴锟叫⌒达拷锟斤拷械摹锟斤拷锟斤拷纾�
CONSTANT 锟斤拷 Constant 锟斤拷锟斤拷锟剿诧拷同锟斤拷值锟斤拷
Note:
锟斤拷小写锟斤拷锟斤拷锟叫的筹拷锟斤拷锟斤拷小写锟侥凤拷式锟斤拷锟芥。
锟缴癸拷时锟斤拷锟斤拷 TRUE锟斤拷 锟斤拷锟斤拷锟斤拷失锟斤拷时锟斤拷锟斤拷 FALSE锟斤拷
Example #1 锟斤拷锟藉常锟斤拷
<?php
define("CONSTANT", "Hello world.");
echo CONSTANT; // 锟斤拷锟� "Hello world."
echo Constant; // 锟斤拷锟� "Constant" 锟斤拷锟斤拷锟斤拷 Notice
define("GREETING", "Hello you.", true);
echo GREETING; // 锟斤拷锟� "Hello you."
echo Greeting; // 锟斤拷锟� "Hello you."
// PHP 7 锟斤拷涂锟斤拷锟斤拷锟斤拷锟斤拷锟�
define('ANIMALS', array(
'dog',
'cat',
'bird'
));
echo ANIMALS[1]; // 锟斤拷锟� "cat"
?>