Zend Preparation | PHP Quiz (Learning Mode)

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Consider the following PHP script:

<?php
$charlist = array (
'a' => 'one', 
'b' => 'two', 
); 
***************
?>

What statement will you write at line number 6 instead of ***** to get the output onectwo?

echo strstr ('acb', $charlist);

echo strtr ('acb', $charlist);

echo strip_tags('acb', $charlist);

echo strtok ('acb', $charlist);

Explanation: Answer option B is correct.

In the given script, the substring 'a' is being converted into the string 'one', and the substring 'b' into the string 'two'. Hence, you will use the strtr() function to accomplish the task. The strtr() function is used to translate certain string into another string. The syntax of the strtr() function is as follows:

strtr(string,from,to) 
strtr(string,array)

Answer option A is incorrect. You will not use the strstr() function to accomplish the task. The strstr() function is used to test whether a string exists within another string. It needs a source string and a substring as an argument. The strstr() function returns false if the substring is absent. When the strstr() function exists, the strstr() function returns the portion of the source string beginning with the substring.

Answer option D is incorrect. The strtok() function is used to split a given string into smaller strings. The syntax of the strtok() function is as follows:

strtok(string,split)

where, the string parameter specifies the string to be split and the split parameter specifies one or more characters to be split.

Answer option C is incorrect. The strip_tags() function is used to remove all PHP, HTML, and XML tags from a given string. The syntax of the strip_tags() function is as follows:

string strip_tags (string $str [, string $allowable_tags])

where the allowable_tags parameter is the list of tags specified by the strip_tags() function that will not be removed. HTML comments are always stripped no matter whether they are allowed under the allowable_tags parameter.

Reference: https://www.php.net/manual/en/function.strtr.php