#What are php string variables?
String variables are used to store and process text.
String variables in PHP
String variables are used for values that contain characters.
After creating the string, we can operate on it. You can use the string directly in the function or store it in a variable.
In the following example, we create a string variable named txt and assign the value to "Hello world!". Then we output the value of the txt variable:
Instance
<?php
$txt="Hello world!";
echo $txt;
?>
Click the "Run Instance" button to view Online example
 | ##Note: When you assign a text value to a variable, please remember to Text values enclosed in single or double quotes. |
|---|
Now, let's take a look at some commonly used functions and operators for manipulating strings.
PHP Concatenation Operator
In PHP, there is only one string operator.
The concatenation operator (.) is used to concatenate two string values.
The following example demonstrates how to concatenate two string variables together:
Example
<?php
$txt1="Hello world!";
$txt2="What a nice day!";
echo $txt1 . " " . $txt2;
?>
Click the "Run Instance" button to view the online instance
The above code will output: Hello world! What a nice day!
Tips: In the above code, we have used the concatenation operator twice. This is due to the fact that we need to insert a space between the two strings.
What are the PHP string functions?
PHP string functions include strlen, strpos, etc.
PHP strlen() function
Sometimes it is useful to know the length of a string value.
strlen() function returns the length of the string (number of characters).
The following example returns the length of the string "Hello world!":
Example
<?php
echo strlen("Hello world!");
?>Click the "Run Instance" button to view the online instance
The above code will output: 12
Tips: strlen() is often used in loops and other functions, because then it is important to determine when the string ends. (For example, in a loop, we need to end the loop after the last character in the string.)
PHP strpos() function
strpos() function is used to Search for a character or a specified text within a string.
If a match is found in the string, this function returns the first matching character position. If no match is found, returns FALSE.
The following example finds the text "world" in the string "Hello world!":
Example
<?php
echo strpos("Hello world!","world");
?>Click the "Run Instance" button to view the online instance
The above code will output: 6
Tips: is above In the example, the position of the string "world" is 6. The reason it's 6 instead of 7 is that the first character in the string is at position 0, not 1.
Complete PHP String Reference Manual
For a complete reference manual for all PHP string functions, please visit our PHP String Reference Manual.
This reference manual provides a brief description and application examples of each function!
