PHP Strings

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

strpos()

str_replace()

substr()

strtolower()

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

strlen()

substr()

str_replace()

strcat()

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

str_split()

explode()

implode()

substr()

4.		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()

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

strrev()

substr()

strlen()

trim()

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

strlen()

strrev()

str_replace()

substr()

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

htmlentities()

htmlspecialchars_decode()

htmlspecialchars()

str_replace()

8.		Which of the following functions is used to count the number of occurrences of a substring in a string in PHP?

strpos()

str_replace()

substr_count()

strlen()

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

strpos()

str_replace()

strstr()

substr()

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

strtolower()

strtoupper()

substr()

strrev()