Ò׽ؽØÍ¼Èí¼þ¡¢µ¥Îļþ¡¢Ãâ°²×°¡¢´¿ÂÌÉ«¡¢½ö160KB

phpÖÐµÄ Àà³£Á¿ Class Constants


It is possible to define constant values on a per-class basis remaining the same and unchangeable.
Constants differ from normal variables in that you don't use the $ symbol to declare or use them. Like static members, constant values cannot be accessed from an instance of the object (using $object::constant).
˵Ã÷£º  const ³£Á¿ ²»Óà $ ·ûºÅ
const ²»¼Ó¹Ø¼ü×Ö private ÐÞÊΠ //Like static members, 
²»ÄÜͨ¹ý ¶ÔÏó·ÃÎÊ¡£ Ö»ÄÜͨ¹ýclass·ÃÎÊ
Àý×Ó 19-15. Defining and using a constant
<?php
class MyClass
{
    const constant = 'constant value';
    function showConstant() {
        echo  self::constant . "\n";
    }
}
echo MyClass::constant . "\n";
$class = new MyClass();
$class->showConstant();
// echo $class::constant;  is not allowed
?>


Ïà¹ØÎĵµ£º

PHP¸ß¼¶Óï·¨£¨ËÄ£©—— ÃæÏò¶ÔÏó£¨Ï£©

8 ·ÃÎÊÀàÐÍ
ÀàÐ͵ķÃÎÊÐÞÊηûÔÊÐí¿ª·¢ÈËÔ±¶ÔÀà³ÉÔ±µÄ·ÃÎʽøÐÐÏÞÖÆ£¬ÕâÊÇPHP5 µÄÐÂÌØÐÔ£¬µ«È´ÊÇOOPÓïÑÔµÄÒ»¸öºÃµÄÌØÐÔ¡£¶øÇÒ´ó¶àÊýOOP ÓïÑÔ¶¼ÒÑÖ§³Ö´ËÌØÐÔ¡£PHP5 Ö§³ÖÈçÏÂ3 ÖÖ·ÃÎÊÐÞÊηû£º
public(¹«Óеġ¢Ä¬ÈϵÄ)£¬private(˽ÓеÄ)ºÍprotected(Êܱ£»¤µÄ)ÈýÖÖ¡£
public ¹«ÓÐÐÞÊηû£¬ÀàÖеijÉÔ±½«Ã»ÓзÃÎÊÏÞÖÆ£¬ËùÓеÄÍⲿ ......

phpÀàʹÓÃ


ת×Ô£ºÒÁÍ¼Íø[www.4ico.com]ÔÚ²ûÊöÀàµÄ¸ÅÄî֮ǰÎÒÃÇÀ´ÏÈËµËµÃæÏò¶ÔÏó±à³ÌµÄ¸ÅÄî£ºÃæÏò¶ÔÏóµÄ³ÌÐòÉè¼Æ(Object-Oriented Programming£¬¼ò¼ÇΪOOP)Á¢ÒâÓÚ´´½¨Èí¼þÖØÓôúÂ룬¾ß±¸¸üºÃµØÄ£ÄâÏÖʵÊÀ½ç»·¾³µÄÄÜÁ¦£¬ÕâʹËü±»¹«ÈÏΪÊÇ×ÔÉ϶øÏ±à³ÌµÄÓÅʤÕß¡£Ëüͨ¹ý¸ø³ÌÐòÖмÓÈëÀ©Õ¹Óï¾ä£¬°Ñº¯Êý“·â×°”½ø±à³ÌËù±ØÐèµÄ&l ......

php——Êý¾ÝÀàÐÍ£¨Ò»£©

Ô­ÎÄÁ´½Ó£ºhttp://www.phpdo.net/index.php/2010/02/03/1-10/
ÓëÆäËû±à³ÌÓïÑÔ²»Í¬µÄÊÇ£ºPHPµÄÊý¾ÝÀàÐͲ»ÊÇÓɳÌÐòÔ±ÔÚ¶¨Òå±äÁ¿µÄʱºò¾ö¶¨µÄ£¬¶øÊÇÓÉPHPÔÚ³ÌÐòÔËÐйý³ÌÖж¨Òå¡£
PHP¹²Ö§³Ö8ÖÖÊý¾ÝÀàÐÍ£ºÕûÐÍ£¨integer£©¡¢¸¡µãÐÍ£¨float£©¡¢×Ö·û´®ÐÍ£¨string£©ºÍ²¼¶ûÐÍ£¨Boolean£©ËÄÖÖ±êÁ¿ÀàÐÍ£¬Êý×飨array£©ºÍ¶ÔÏó£¨object£ ......

ÎÒµÄ2009Ä깤×÷¾­ÑéС½á(php³ÌÐòÔ±)

תÑÛÓÖÊÇÒ»Äê¹ýÈ¥ÁË£¬Ëƺõ£¬×î½üÎåÁùÄêÀ´£¬Ò»Ö±¶¼¹ýµÃ²»ÄÇô˳Àû£¬½ñÄ껹ËãÊDz»´í£¬ÖÁÉÙ£¬ÔÚ¿Í»§¡¢ÀϰåºÍͬʵİïÖúÏ£¬Ò»ÄêµÄ¹¤×÷£¬ÖÕÓÚÔÚÄêǰÊÕβÁË¡£ÔÚ´ËС½áһϣ¬ÎüȡһЩ½Ìѵ£¬ÒÔÃâÀ´ÄêÖØ·¸ÏàͬµÄ´íÎó¡£
1¡¢×öÁËÒ»¸ö×îÕýÈ·µÄÑ¡Ôñ£º¹Ò¿¿Ò»¼ÒÈí¼þ¹«Ë¾×ö³ÌÐò¡£×ö³ÌÐòºÍ×öÒµÎñ£¬ÊDz»Ó¦¸Ãͬһ¸öÈ˽øÐе쬾ÍËã¿Í»§ÊÇÖ÷¶¯É ......

php ÕýÔò±í´ïʽ ÐÞÊηû

i £ºÈç¹ûÔÚÐÞÊηûÖмÓÉÏ"i"£¬ÔòÕýÔò½«»áÈ¡Ïû´óСдÃô¸ÐÐÔ£¬¼´"a"ºÍ"A" ÊÇÒ»ÑùµÄ¡£
U£ººÍÎʺŵÄ×÷Óò¶à£¬ÓÃÓÚÉèÖÃ"̰À·Ä£Ê½"¡£
m£ºÄ¬ÈϵÄÕýÔò¿ªÊ¼"^"ºÍ½áÊø"$"Ö»ÊǶÔÓÚÕýÔò×Ö·û´®Èç¹ûÔÚÐÞÊηûÖмÓÉÏ"m"£¬ÄÇô¿ªÊ¼ºÍ½áÊø½«»áÖ¸×Ö·û´®µÄÿһÐУºÃ ......
© 2009 ej38.com All Rights Reserved. ¹ØÓÚE½¡ÍøÁªÏµÎÒÃÇ | Õ¾µãµØÍ¼ | ¸ÓICP±¸09004571ºÅ