Four PHP text functions strstr strrchr substr STRISTR

strstr function $email = ' liruxing1715@sina.com@qq.com '; $domain = Strstr ($email, ' @ '); echo "strstr test result: {$domain} "; $domain = Strstr ($email, ' @ ', true); echo "strstr test result: {$domain} "; /* The test results are: STRSTR test Result: @sina. com@qq.com STRSTR test Result: liruxing1715 */ ?> Copy Code Note: If the string you are looking for is not found, then return FALSE. 2, Stristrstristr-function and strstr function, the only difference is that the case is unclear. 3, STRRCHRstrrchr-displays the last found, the string to find, and the following string. STRRCHR function $email = ' liruxing1715@sina.com@qq.com '; $domain = STRRCHR ($email, ' @ '); echo "STRRCHR test result: {$domain} "; /* The test results are: STRRCHR test Result: @qq. com */ ?> Copy Code Note: If the string you are looking for is not found, then return FALSE. 4. substrsubstr-in a string, the character is intercepted according to the given length. Format: String substr (string $string, int $start [, int $length]) parameter description: $string: the string to intercept; $start: The starting position to intercept, starting from 0 by default, if Start is A negative number, the returned string starts at the end of the $string $start character, or FALSE if the length of the string is less than or equal to start. $length: The end position of the intercept, if the first $length is empty, then return from the start position to the end. substr function $email = ' liruxing1715@sina.com@qq.com '; $domain = substr ($email, 10); echo "substr test result: {$domain} "; $domain = substr ($email, 10, 5); echo "substr test result: {$domain} "; $domain = substr ($email,-5, 5); The last digit of the string is-1 echo "substr test result: {$domain} "; /* The test results are: SUBSTR test Result: 15@sina.com@qq.com SUBSTR test Result: 15@si SUBSTR test Result: q.com */ ?> Copy Code

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