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!":
| <!DOCTYPE html> <html> <body> <?php echo strlen("Hello world!"); ?> </body> </html> |
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:| <!DOCTYPE html> <html> <body> <?php echo str_word_count("Hello world!"); ?> </body> </html> |
The output of the code above will be: 2.
Reverse a String
The PHP
strrev() function reverses a string:| <!DOCTYPE html> <html> <body> <?php echo strrev("Hello world!"); ?> </body> </html> |
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!":
| <!DOCTYPE html> <html> <body> <?php echo strpos("Hello world!", "world"); ?> </body> </html> |
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":
| <!DOCTYPE html> <html> <body> <?php echo str_replace("world", "Dolly", "Hello world!"); ?> </body> </html> |
The output of the code above will be: Hello Dolly!
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