What are the differences between the PHP functions rtrim() and ltrim() in terms of removing characters?

The PHP functions rtrim() and ltrim() are used to remove characters from the end and beginning of a string, respectively. rtrim() removes characters from the right side of the string, while ltrim() removes characters from the left side. It is important to note that both functions only remove characters specified in the second parameter, which defaults to whitespace if not provided. 

// Example of using rtrim() and ltrim() functions
$string = "  Hello World  ";

// Using rtrim() to remove whitespace from the right side of the string
$trimmedRight = rtrim($string);

// Using ltrim() to remove whitespace from the left side of the string
$trimmedLeft = ltrim($string);

echo "Original String: $string\n";
echo "String after rtrim(): $trimmedRight\n";
echo "String after ltrim(): $trimmedLeft\n";

Keywords

PHP rtrim() ltrim() characters differences

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