PHP
5 Strings
A string is
a sequence of characters, like "Hello world!".
PHP String
Functions
In this
chapter we will look at some commonly used functions to manipulate strings.
Get The
Length of a String
The PHP
strlen() function returns the length of a string.
The example
below returns the length of the string "Hello world!":
Example
<?php
echo
strlen("Hello world!"); // outputs 12
?>
The output
of the code above will be: 12.
Count The
Number of Words in a String
The PHP
str_word_count() function counts the number of words in a string:
Example
<?php
echo
str_word_count("Hello world!"); // outputs 2
?>
The output
of the code above will be: 2.
Reverse a
String
The PHP
strrev() function reverses a string:
Example
<?php
echo
strrev("Hello world!"); // outputs !dlrow olleH
?>
The output
of the code above will be: !dlrow olleH.
Search For a
Specific Text Within a String
The PHP
strpos() function searches for a specific text within a string.
If a match
is found, the function returns the character position of the first match. If no
match is found, it will return FALSE.
The example
below searches for the text "world" in the string "Hello
world!":
Example
<?php
echo
strpos("Hello world!", "world"); // outputs 6
?>
The output
of the code above will be: 6.
Tip: The
first character position in a string is 0 (not 1).
Replace Text
Within a String
The PHP
str_replace() function replaces some characters with some other characters in a
string.
The example
below replaces the text "world" with "Dolly":
Example
<?php
echo
str_replace("world", "Dolly", "Hello world!"); //
outputs Hello Dolly!
?>
The output
of the code above will be: Hello Dolly!
Complete PHP
String Reference
For a
complete reference of all string functions, go to our complete PHP String
Reference.
The PHP
string reference contains description and example of use, for each function!
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