Write a program in PHP to implement the following functions

Write a program to implement the following functions:

a. How to determine whether a character exists in a string

echo strstr('abcdefgcd'  , 'cd');
 echo strpos('ab0defgcd'  , 'cd');

Example:

b. How to determine a string How many times does a character appear in?

echo substr_count('abcdefgcd'  , 'cd');

Example:

c. How to remove the last character of a string

echo substr('abcdefgcd'  , 0 ,  -1);

Example:

$str = "1,2,3,4,5,6,"; 
$newstr = substr($str,0,strlen($str)-1); 
echo $newstr; 
//echo 1,2,3,4,5,6

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