目錄strncmp函數原型源碼分析 版本PHP 5.6.401、Zend/zend_builtin_functions.c (內置函數)2、Zend/zend_operators.c3、memcmp 用法strncmp函數原型

源碼分析 版本PHP 5.6.401、Zend/zend_builtin_functions.c (內置函數)ZEND_FUNCTION(strncmp){ char *s1, *s2; int s1_len, s2_len; long len; if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, 'ssl', &s1, &s1_len, &s2, &s2_len, &len) == FAILURE) {return; } if (len < 0) {zend_error(E_WARNING, 'Length must be greater than or equal to 0');RETURN_FALSE; } RETURN_LONG(zend_binary_strncmp(s1, s1_len, s2, s2_len, len));}2、Zend/zend_operators.cZEND_API int zend_binary_strncmp(const char *s1, uint len1, const char *s2, uint len2, uint length) /* {{{ */{ int retval; if (s1 == s2) {return 0; } retval = memcmp(s1, s2, MIN(length, MIN(len1, len2))); if (!retval) {return (MIN(length, len1) - MIN(length, len2)); } else {return retval; }}3、memcmp 用法

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