Output of PHP programs | Set 3 Last Updated : 16 Jan, 2023 Summarize Comments Improve Suggest changes Share Like Article Like Report Predict the output of below PHP programs: Question 1 PHP <?php $number = array(0, 1, one, two, three, 5); $num = preg_grep("/[0-5]/", $number); print_r($num); ?> Options: Array([0]=>0 [1]=>1 [2]=>one [3]=>two [4]=>three [5]=>5) Array([2]=>one [3]=>two [4]=>three) Array([1]=> 1) Array([0]=>0 [1]=>1 [5]=>5) Output: Array([0]=>0 [1]=>1 [5]=>5) Explanation: The preg_grep() function is used to search an array for specific patterns and then return a new array based on that filtering. Question 2 PHP <?php $number = array(0, 1, one, two, three, 5); $num = preg_grep("/[0-5]/", $number, PREG_GREP_INVERT); print_r($num); ?> Options: Array([0]=>0 [1]=>1 [2]=>one [3]=>two [4]=>three [5]=>5) Array([2]=>one [3]=>two [4]=>three) Array([1]=> 1) Array([0]=>0 [1]=>1 [5]=>5) Output: Array([2]=>one [3]=>two [4]=>three) Explanation: When we include PREG_GREP_INVERT, this will invert our data, so instead of outputting numbers it will output our non-numeric values. Question 3 PHP <?php $name = "I am intern at GeeksforGeeks."; if (preg_match("/at/",$name)) echo "My name is Sagar Shukla"; else echo "My name is not Sagar Shukla"; ?> Options: My name is Sagar Shukla My name is not Sagar Shukla Error No Output Output: My name is Sagar Shukla Explanation: The code uses preg_match() to check for a keyword and replies based on whether it is true (1) or false (0). Question 4 PHP <?php $name = "I am intern at GeeksforGeeks."; if (preg_match("/was/",$name)) echo "My name is Sagar Shukla"; else echo "My name is not Sagar Shukla"; ?> Options: My name is Sagar Shukla My name is not Sagar Shukla Error No Output Output: My name is not Sagar Shukla Explanation: The code uses preg_match to check for a keyword and replies based on whether it is true (1) or false (0). Question 5 PHP <?php $str = "I am intern at GeeksforGeeks"; $find = array('/am/'); $replace = array('was'); echo preg_replace ($find, $replace, $str); ?> Options: I am intern at GeeksforGeeks I was intern at GeeksforGeeks Error No Output Output: I was intern at GeeksforGeeks Explanation: In the above program, am replaced with was as preg PHP function is used to do a find and replace on a string or an array. Question 6 PHP <?php $str = "I am intern at GeeksforGeeks"; $find = array('/geeksforgeeks/'); $replace = array('GEEKSFORGEEKS'); echo preg_replace ($find, $replace, $str); ?> Options: I am intern at GeeksforGeeks I am intern at GEEKSFORGEEKS Error No Output Output: I am intern at GeeksforGeeks Explanation: GeeksforGeeks was not replaced because the preg_replace function is case sensitive. Therefore it treats GeeksforGeeks and geeksforgeeks differently. Question 7 PHP <?php $line = "Hello. Welcome to GeeksforGeeks!"; $sen = preg_split('/\./', $line); print_r($sen); ?> Options: Hello. Welcome to GeeksforGeeks! Array([0]=> Hello. Welcome to GeeksforGeeks!) Array([0]=> Hello [1]=> Welcome to GeeksforGeeks! ) Error Output: Array([0]=> Hello [1]=> Welcome to GeeksforGeeks! ) Explanation: We use a ‘.’ period to split the data, therefore giving each sentence it’s own array entry. 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