PHP Strings

1.		Which of the following functions is used to trim whitespace from the beginning and end of a string in PHP?

strrev()

substr()

strlen()

trim()

2.		Which of the following functions is used to convert an array to a string in PHP?

str_split()

explode()

implode()

substr()

3.		Which of the following functions is used to join the elements of an array into a string in PHP?

substr()

str_replace()

explode()

implode()

4.		Which of the following functions is used to check if a string contains a specific substring in PHP?

strpos()

str_replace()

strstr()

substr()

5.		Which of the following functions is used to convert HTML entities to their corresponding characters in PHP?

htmlentities()

htmlspecialchars_decode()

htmlspecialchars()

str_replace()

6.		Which of the following functions is used to compare two strings in PHP?

strcmp()

str_replace()

strlen()

substr()

7.		What function is used to convert a string to all uppercase characters in PHP?

strtoupper()

strtolower()

substr()

strrev()

8.		Which of the following functions is used to pad a string with a specified character to a certain length in PHP?

str_pad()

str_replace()

substr()

strlen()

9.		Which of the following functions is used to find the position of the first occurrence of a substring in a string in PHP?

strpos()

str_replace()

strlen()

substr()

10.		Which of the following functions is used to convert special characters to HTML entities in PHP?

htmlentities()

htmlspecialchars_decode()

htmlspecialchars()

str_replace()