point.comPHP Strings Function
PHP includes built-in string functions which enable developers to manipulate and analyze text data efficiently. These functions enable tasks such as measuring string length via strlen(), replacing text content with str_replace(), and formatting strings through sprintf().
These functions serve critical roles in validation processes as well as parsing input and content display preparation. PHP provides numerous string functions including strpos(), substr(), and trim() that simplify different string manipulation tasks.
| Function | Description | Example Code | Output / Result |
|---|---|---|---|
| strlen() | Returns the length of a string | strlen("Hello") | 5 |
| strtoupper() | Converts a string to uppercase | strtoupper("hello") | HELLO |
| strtolower() | Converts a string to lowercase | strtolower("HELLO") | hello |
| ucfirst() | Uppercases first character | ucfirst("hello") | Hello |
| lcfirst() | Lowercases first character | lcfirst("Hello") | hello |
| ucwords() | Capitalizes the first letter of each word | ucwords("hello world") | Hello World |
| strrev() | Reverses a string | strrev("PHP") | PHP |
| strpos() | Finds position of first occurrence of substring | strpos("Hello World", "World") | 6 |
| stripos() | Case-insensitive version of strpos() | stripos("Hello World", "world") | 6 |
| str_replace() | Replaces all occurrences of a substring | str_replace("cat", "dog", "catfish") | dogfish |
| substr() | Extracts part of a string | substr("abcdef", 1, 3) | bcd |
| trim() | Removes whitespace from both ends | trim(" hello ") | hello |
| ltrim() | Removes whitespace from the left | ltrim(" hello") | hello |
| rtrim() | Removes whitespace from the right | rtrim("hello ") | hello |
| explode() | Splits a string into an array | explode(",", "a,b,c") | ["a", "b", "c"] |
| implode() | Joins array elements into a string | implode("-", ["a", "b", "c"]) | "a-b-c" |
| str_repeat() | Repeats a string multiple times | str_repeat("Ha", 3) | HaHaHa |
| strcmp() | Compares two strings (case-sensitive) | strcmp("a", "A") | > 0 (since "a" > "A") |
| str_ireplace() | Case-insensitive replace | str_ireplace("HELLO", "Hi", "hello") | Hi |
| number_format() | Formats a number with grouped thousands | number_format(1234567) | 1,234,567 |
Example
<?php
$name = " alice cooper ";
$cleanName = ucwords(trim($name));
echo "Cleaned Name: $cleanName<br>";
$sentence = "PHP is amazing!";
echo "Uppercase: " . strtoupper($sentence) . "<br>";
echo "Reversed: " . strrev($sentence) . "<br>";
$words = explode(" ", $sentence);
print_r($words);
$joined = implode("-", $words);
echo "<br>Joined: $joined";
?>
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