PHP ltrim () function
Examples
Remove the left side of the character string:
<?php
$str = "Hello World!";
echo $str . "<br>";
echo ltrim($str,"Hello");
?>
$str = "Hello World!";
echo $str . "<br>";
echo ltrim($str,"Hello");
?>
Running instance »
Definition and Usage
ltrim () function removes the left side of a string of blank characters or other predefined characters.
Related functions:
- RTRIM () - remove the right of a string of blank characters or other predefined characters.
- the TRIM () - Remove both sides of a string of blank characters or other predefined characters.
grammar
ltrim( string,charlist )
| 参数 | 描述 |
|---|---|
| string | 必需。规定要检查的字符串。 |
| charlist | 可选。规定从字符串中删除哪些字符。如果省略该参数，则移除下列所有字符：
|
technical details
| return value: | Returns the modified string. |
|---|---|
| PHP version: | 4+ |
| Update log: | In PHP 4.1, add the charlist parameters. |
More examples
Example 1
Remove string of spaces on the left side:
<?php
$str = " Hello World!";
echo "Without ltrim: " . $str;
echo "<br>";
echo "With ltrim: " . ltrim($str);
?>
$str = " Hello World!";
echo "Without ltrim: " . $str;
echo "<br>";
echo "With ltrim: " . ltrim($str);
?>
HTML output of the code above is as follows (view source):
<!DOCTYPE html>
<html>
<body>
Without ltrim: Hello World!<br>With ltrim: Hello World!
</body>
</html>
<html>
<body>
Without ltrim: Hello World!<br>With ltrim: Hello World!
</body>
</html>
Browser output of the code above is as follows:
Without ltrim: Hello World!
With ltrim: Hello World!
With ltrim: Hello World!
Running instance »
Example 2
Remove the string to the left of line breaks (\ n):
<?php
$str = "nnnHello World!";
echo "Without ltrim: " . $str;
echo "<br>";
echo "With ltrim: " . ltrim($str);
?>
$str = "nnnHello World!";
echo "Without ltrim: " . $str;
echo "<br>";
echo "With ltrim: " . ltrim($str);
?>
HTML output of the code above is as follows (view source):
<!DOCTYPE html>
<html>
<body>
Without ltrim:
Hello World!<br>With ltrim: Hello World!
</body>
</html>
<html>
<body>
Without ltrim:
Hello World!<br>With ltrim: Hello World!
</body>
</html>
Browser output of the code above is as follows:
Without ltrim: Hello World!
With ltrim: Hello World!
With ltrim: Hello World!
Running instance »
PHP String Reference