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--TEST-- Test strtok() function : usage variations - modifying the input string while tokenising --FILE-- <?php /* Prototype : string strtok ( str $str, str $token ) * Description: splits a string (str) into smaller strings (tokens), with each token being delimited by any character from token * Source code: ext/standard/string.c */ /* * Testing strtok() : modifying the input string while it is getting tokenised */ echo "*** Testing strtok() : with modification of input string in between tokenising ***\n"; $str = "this is a sample string"; $token = " "; echo "\n*** Testing strtok() when string being tokenised is prefixed with another string in between the process ***\n"; var_dump( strtok($str, $token) ); // adding a string to the input string which is being tokenised $str = "extra string ".$str; for( $count = 1; $count <=6; $count++ ) { echo "\n-- Token $count is --\n"; var_dump( strtok($token) ); echo "\n-- Input str is \"$str\" --\n"; } echo "\n*** Testing strtok() when string being tokenised is suffixed with another string in between the process ***\n"; var_dump( strtok($str, $token) ); // adding a string to the input string which is being tokenised $str = $str." extra string"; for( $count = 1; $count <=10; $count++ ) { echo "\n-- Token $count is --\n"; var_dump( strtok($token) ); } echo "Done\n"; ?> --EXPECTF-- *** Testing strtok() : with modification of input string in between tokenising *** *** Testing strtok() when string being tokenised is prefixed with another string in between the process *** string(4) "this" -- Token 1 is -- string(2) "is" -- Input str is "extra string this is a sample string" -- -- Token 2 is -- string(1) "a" -- Input str is "extra string this is a sample string" -- -- Token 3 is -- string(6) "sample" -- Input str is "extra string this is a sample string" -- -- Token 4 is -- string(6) "string" -- Input str is "extra string this is a sample string" -- -- Token 5 is -- bool(false) -- Input str is "extra string this is a sample string" -- -- Token 6 is -- bool(false) -- Input str is "extra string this is a sample string" -- *** Testing strtok() when string being tokenised is suffixed with another string in between the process *** string(5) "extra" -- Token 1 is -- string(6) "string" -- Token 2 is -- string(4) "this" -- Token 3 is -- string(2) "is" -- Token 4 is -- string(1) "a" -- Token 5 is -- string(6) "sample" -- Token 6 is -- string(6) "string" -- Token 7 is -- bool(false) -- Token 8 is -- bool(false) -- Token 9 is -- bool(false) -- Token 10 is -- bool(false) Done