Remove characters on the left side of a string ("He" in "Hello" and "d!" in "World"):
<?php$str = "Hello World!";echo $str . "<br>";echo trim($str,"Hed!");?>The trim() function removes whitespace or other predefined characters from either side of a string.
Related functions:
ltrim() - Removes whitespace characters or other predefined characters from the left side of a string.
rtrim() - Removes whitespace characters or other predefined characters on the right side of a string.
trim( string,charlist )
| parameter | describe |
|---|---|
| string | Required. Specifies the string to check. |
| charlist | Optional. Specifies which characters are removed from a string. If this parameter is omitted, all the following characters are removed: " " - NULL "t" - tab character "n" - newline "x0B" - vertical tab character "r" - carriage return " " - space |
| Return value: | Returns the modified string. |
|---|---|
| PHP version: | 4+ |
| Update log: | In PHP 4.1, the charlist parameter was added. |
Remove spaces from both sides of a string:
<?php$str = " Hello World! ";echo "Without trim: " . $str;echo "<br>";echo "With trim: " . trim($str);?>The HTML output of the above code is as follows (view source code):
<!DOCTYPE html><html><body>Without trim: Hello World! <br>With trim: Hello World!</body></html>The browser output of the above code is as follows:
Without trim: Hello World!With trim: Hello World!Remove newlines (n) from either side of a string:
<?php$str = "nnnHello World!nnn";echo "Without trim: " . $str;echo "<br>";echo "With trim: " . trim($str);?>The HTML output of the above code is as follows (view source code):
<!DOCTYPE html><html><body>Without trim:Hello World!<br>With trim: Hello World!</body></html>The browser output of the above code is as follows:
Without trim: Hello World!With trim: Hello World!