Sequence of characters, usually assigned to a variable.


	$myLocation = "London" ;

	$myString = "I live in $myLocation" ; //will interpolate London in place of $myLocation

	$yourString = 'I live in $myLocation' ; //will literally use the text $myLocation


I live in London
I live in $myLocation




Joining of strings by use of the dot . operator.


	$stringOne = "London" ;

	$stringTwo = "I live in " ;

	echo $stringTwo . $stringOne ;


I live in London



A few String Functions


strlen($myVar) ; //returns the number of characters in the string


strpos("I live in London", "London") ; //crude example, strings could be replaced by variables


explode($myVar) ; //breaks a string into an array


implode(" ", $myArray) ; //returns a string from the elements of an array. Note use of optional separator


md5($myVar) ; //calculates the MD5 hash of a string


md5_file($fileHandle) ; //calculates the MD5 hash of a file


strtolower($myString) ; //converts string to lowercase letters


strtoupper($myString) ; //converts string to uppercase letters


Leave a Reply