PHP String Variables
PHP String Variables
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A string variable is used to store and manipulate text.
String Variables in PHP
String variables are used for values that contain characters.
In this chapter we are going to look at the most common functions
and operators used to manipulate strings in PHP.
After we create a string we can manipulate it. A string can be used directly
in a function or it can be stored in a variable.
Below, the PHP script assigns the text "Hello World" to a string variable called $txt:
<?相用
$txt="Hello World";
echo $txt;
?>
The output of the code above will be:
Hello World
Now, lets try to use some different functions and operators to manipulate the
string.
The Concatenation Operator
There is only one string operator in PHP.
The concatenation operator (.) is used to put two string values together.
To concatenate two string variables together, use the concatenation operator:
<?相用
$txt1="Hello World!";
$txt2="What a nice day!";
echo $txt1 . " " . $txt2;
?>
The output of the code above will be:
Hello World! What a nice day!
If we look at the code above you see that we used the concatenation operator
two times. This is because we had to insert a third string (a space character), to separate the two
strings.
The strlen() function
The strlen() function is used to return the length of a string.
Let's find the length of a string:
<?相用
echo strlen("Hello world!");
?>
The output of the code above will be:
12
The length of a string is often used in loops or other functions, when it is
important to know when the string ends. (i.e. in a loop, we would want to stop
the loop after the last character in the string).
The strpos() function
The strpos() function is used to search for a character/text within a
string.
If a match is found, this function will return the character position of
the first match. If no match is found, it will return FALSE.
Let's see if we can find the string "world" in our string:
<?相用
echo strpos("Hello world!","world");
?>
The output of the code above will be:
6
The position of the string "world" in the example above is 6.
The reason that it is 6 (and not 7), is that the first character position in the string is
0, and not 1.
Complete PHP String Reference
For a complete reference of all string functions, go to our
complete PHP String Reference.
The reference contains a brief description, and examples of use, for each
function!
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