Remove characters on the left side of a string:
<?php$str = "Hello World!";echo $str . "<br>";echo ltrim($str,"Hello");?>The ltrim() function removes whitespace characters or other predefined characters from the left side of a string.
Related functions:
rtrim() - Removes whitespace or other predefined characters from the right side of a string.
trim() - removes whitespace characters or other predefined characters on either side of a string.
ltrim( 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 on the left side of a string:
<?php$str = " Hello World!";echo "Without ltrim: " . $str;echo "<br>";echo "With ltrim: " . ltrim($str);?>The HTML output of the above code is as follows (view source code):
<!DOCTYPE html><html><body>Without ltrim: Hello World!<br>With ltrim: Hello World!</body></html>The browser output of the above code is as follows:
Without ltrim: Hello World!With ltrim: Hello World!Remove newlines (n) on the left side of a string:
<?php$str = "nnnHello World!";echo "Without ltrim: " . $str;echo "<br>";echo "With ltrim: " . ltrim($str);?>The HTML output of the above code is as follows (view source code):
<!DOCTYPE html><html><body>Without ltrim: Hello World!<br>With ltrim: Hello World!</body></html>The browser output of the above code is as follows:
Without ltrim: Hello World!With ltrim: Hello World!