(PHP 4, PHP 5, PHP 7, PHP 8)
rtrim — Strip whitespace (or other characters) from the end of a string
This function returns a string with whitespace (or other characters) stripped from the
end of string.
Without the second parameter, rtrim() will strip these characters:
" ": ASCII SP character
0x20, an ordinary space.
"\t": ASCII HT character
0x09, a tab.
"\n": ASCII LF character
0x0A, a new line (line feed).
"\r": ASCII CR character
0x0D, a carriage return.
"\0": ASCII NUL character
0x00, the NUL-byte.
"\v": ASCII VT
character 0x0B, a vertical tab.
stringcharacterscharacters parameter.
Simply list all characters that need to be stripped.
With .. it is possible to specify an incrementing range of characters.
Returns the modified string.
Example #1 Usage example of rtrim()
<?php
$text = "\t\tThese are a few words :) ... ";
$binary = "\x09Example string\x0A";
$hello = "Hello World";
var_dump($text, $binary, $hello);
print "\n";
$trimmed = rtrim($text);
var_dump($trimmed);
$trimmed = rtrim($text, " \t.");
var_dump($trimmed);
$trimmed = rtrim($hello, "Hdle");
var_dump($trimmed);
// trim the ASCII control characters at the end of $binary
// (from 0 to 31 inclusive)
$clean = rtrim($binary, "\x00..\x1F");
var_dump($clean);
?>The above example will output:
string(32) " These are a few words :) ... " string(16) " Example string " string(11) "Hello World" string(30) " These are a few words :) ..." string(26) " These are a few words :)" string(9) "Hello Wor" string(15) " Example string"
Example #1 similar_text() argument swapping example
This example shows that swapping the string1 and
string2 argument may yield different results.
<?php
$sim = similar_text('bafoobar', 'barfoo', $perc);
echo "similarity: $sim ($perc %)\n";
$sim = similar_text('barfoo', 'bafoobar', $perc);
echo "similarity: $sim ($perc %)\n";The above example will output something similar to:
similarity: 5 (71.428571428571 %) similarity: 3 (42.857142857143 %)