$ man strstr char *strstr(const char *haystack, const char *needle); ãªãã¸ã§ã¯ã A ãããªãã¸ã§ã¯ã B ãè¦ã¤ãã颿°ãæ¸ãå ´åããªãã¸ã§ã¯ã A ã« haystack ããªãã¸ã§ã¯ã B ã« needle ã¨ãã弿°åãä»ããã®ã¯ PHP ã®æåã ã¨æã£ã¦ããã®ã§ãããã©ããã UNIX ã®æåã ã¨ãããã¨ã夿ãã¾ãããå°ã調ã¹ã¦ã¿ãæãã ã¨ã Needdle in a haystack ãã¨ããè±èªã®ã¤ãã£ãªã ãå ãã¿ã«ãªã£ã¦ãããããã¦ãæå³ã¯ãè¦ã¤ããã®ãå°é£ãªããã大ããªãªãã¸ã§ã¯ã (haystack) ã®ä¸ã«ãããªãã¸ã§ã¯ã (needle) ããããã§ã [1] ãç´è¨³ã ã¨ãå¹²ãèã®å±±ã®ä¸ã®éãã§ããããããå³ã®ããååã¯å¥½ãã§ãããããã£ãã©ãªãä½ãã¨ãã£ã±ãæå³ãããããªãã¨ããå¼å®³ãä¼´ãã¾ãã
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