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 check if a string contains a specific substring in PHP?

strpos()

str_replace()

strstr()

substr()

3.		Which of the following functions is used to concatenate two or more strings in PHP?

strlen()

substr()

str_replace()

strcat()

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

substr()

str_replace()

explode()

implode()

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

strcmp()

str_replace()

strlen()

substr()

6.		What function is used to determine the length of a string in PHP?

strlen()

strrev()

str_replace()

substr()

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

strtolower()

strtoupper()

substr()

strrev()

8.		Which of the following functions is used to replace a substring with another string in PHP?

strpos()

str_replace()

substr()

strtolower()

9.		Which of the following functions is used to split a string into an array of substrings in PHP?

substr()

str_replace()

explode()

implode()

10.		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()