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40 Tips for optimizing your php Code
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1. If a method can be static, declare it static. Speed improvement is by a factor of 4. Èç¹ûÒ»¸ö·½·¨¿É¾²Ì¬»¯£¬¾Í¶ÔËü×ö¾²Ì¬ÉùÃ÷¡£ËÙÂÊ¿ÉÌáÉýÖÁ4±¶¡£
2. echo is faster than print. echo ±È print ¿ì¡£
3. Use echo’s multiple parameters instead of string concatenation. ʹÓÃechoµÄ¶àÖØ²ÎÊý£¨Òë×¢£ºÖ¸ÓöººÅ¶ø²»ÊǾäµã£©´úÌæ×Ö·û´®Á¬½Ó¡£
4. Set the maxvalue for your for-loops before and not in the loop. ÔÚÖ´ÐÐforÑ­»·Ö®Ç°È·¶¨×î´óÑ­»·Êý£¬²»ÒªÃ¿Ñ­»·Ò»´Î¶¼¼ÆËã×î´óÖµ¡£
5. Unset your variables to free memory, especially large arrays. ×¢ÏúÄÇЩ²»ÓõıäÁ¿ÓÈÆäÊÇ´óÊý×飬ÒÔ±ãÊÍ·ÅÄÚ´æ¡£
6. Avoid magic like __get, __set, __autoload ¾¡Á¿±ÜÃâʹÓÃ__get£¬__set£¬__autoload¡£
7. require_once() is expensive require_once()´ú¼Û°º¹ó¡£
8. Use full paths in includes and requires, less time spent on resolving the OS paths. ÔÚ°üº¬ÎļþʱʹÓÃÍêÕû·¾¶£¬½âÎö²Ù×÷ϵͳ·¾¶ËùÐèµÄʱ¼ä»á¸üÉÙ¡£
9.
If you need to find out the time when the script started executing,
$_SERVER[’REQUEST_TIME’] is preferred to time()
Èç¹ûÄãÏëÖªµÀ½Å±¾¿ªÊ¼Ö´ÐУ¨Òë×¢£º¼´·þÎñÆ÷¶ËÊÕµ½¿Í»§¶ËÇëÇ󣩵Äʱ¿Ì£¬Ê¹ÓÃ$_SERVER[‘REQUEST_TIME’]ÒªºÃÓÚtime()¡£
10. See if you can use strncasecmp, strpbrk and stripos instead of regex. ¼ì²éÊÇ·ñÄÜÓÃstrncasecmp£¬strpbrk£¬striposº¯Êý´úÌæÕýÔò±í´ïʽÍê³ÉÏàͬ¹¦ÄÜ¡£
11.
str_replace is faster than preg_replace, but strtr is faster than
str_replace by a factor of 4.
str_replaceº¯Êý±Èpreg_replaceº¯Êý¿ì£¬µ«strtrº¯ÊýµÄЧÂÊÊÇstr_replaceº¯ÊýµÄËı¶¡£
12.
If the function, such as string replacement function, accepts both
arrays and single characters as arguments, and if your argument list is
not too long, consider writing a few redund


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