1.èªå®ä¹å¸¸é
* å¿
é¡»ç¨å½æ°define()å®ä¹
* å®ä¹å®åå
¶å¼ä¸è½åæ¹åäº
* 使ç¨æ¶ç´æ¥ç¨å¸¸éåï¼ä¸è½ååéä¸æ ·å¨åé¢å $s
ä¾å¦ï¼define("PI",3.14);å®ä¹ä¸ä¸ªå¸¸é
$area = PI*R*R; 计ç®åçé¢ç§¯
define("URL","
http://www.jb51.net");
echo "æçç½åæ¯ï¼".URL;
2 ç³»ç»å¸¸éï¼
FILE :phpç¨åºæ件å
LINE :PHPç¨åºæ件è¡æ°
PHP_VERSION:å½å解æå¨ççæ¬å·
PHP_OSï¼æ§è¡å½åPHPçæ¬çæä½ç³»ç»å称
å¯ä»¥ç´æ¥æ¿æ¥ä½¿ç¨ï¼ä¾å¦è¦æ¥çæ§è¡å½åPHPçæ¬çæä½ç³»ç»å称ï¼å°±å¯ä»¥åæ echo PHP_OS