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PHP function is a portion of code that can be recycled many times. It can take effort as argument list and reappearance value. There are thousands of built-in functions in PHP. In this article we will be exploring Trim Function In PHP. Following pointers will be covered in this article,
Features Of PHP Functions
Code Reusability
PHP functions are defined only once and can be raised many times, like in other programming languages.
Less Code
It protects a lot of code because you don’t need to write the logic several times. By the use of function, you can write the logic only one time and use it again and again as per the need .
Easy to understand
PHP functions discrete the programming logic. Therefore, it is calmer to understand the drift of the submission because every logic is divided in the form of functions.
We can stipulate a default argument value in function. While calling PHP function if you don’t stipulate any argument, it will take the default argument.
Moving on with this article on Trim Function In PHP
Trim Function In PHP
Removes characters from both sides of a string (“He” in “Head” and “d!” in “sherd”)
<?php $str = "Hello sherd!";echo $str."<br>";echo trim($str,"Hed!");?>
The trim () function eliminates whitespace and other predefined characters from both sides of a string.
Related Functions h3
ltrim()
Eliminates whitespace or other predefined characters from the left side of a string. rtrim() – Eliminates whitespace or other predefined characters from the right side of a string.
Syntax
trim(string,charlist)
Trim is the fastest way to remove first and last character
Sample Code
<?php $s = '/catalog/lyustry/svet/dom-i-svet/';
$times = 100000;
print cycle("str_preg('$s');", $times);
print cycle("str_preg2('$s');", $times);
print cycle("str_sub_replace('$s');", $times);
print cycle("str_trim('$s');", $times);
print cycle("str_clear('$s');", $times);
//print_r(str_preg2($s));
function cycle($function, $times){
$count = 0; if($times < 1){
return false; } $start = microtime(true); while($times > $count){
eval($function); $count++; } $end = microtime(true) - $start; return "n $function exec time: $end"; }
function str_clear($s){ $s = explode('/', $s); $s = array_filter($s, function ($s){if(!empty($s)) return true;}); return $s; } function str_preg2($s){
$s = preg_replace('/((?<!.)/(?=.))?((?<=.)/(?!.))?/i', '', $s); $s = explode('/', $s); return $s; } function str_preg($s){
$s = preg_replace('/^(/?)(.*?)(/?)$/i', '$2', $s); $s = explode('/', $s); return $s; } function str_sub_replace($s){
$s = str_replace('/' , '' , mb_substr( $s , 0, 1)) . mb_substr( $s , 1, -1) . str_replace('/', '', mb_substr( $s , -1));
$s = explode('/', $s); return $s; } function str_trim($s){ $s = trim($s, '/'); $s = explode('/', $s); return $s; }Parameters
The function accepts one mandatory parameter and one optional parameter as shown in the above syntax and described below.
$string
This parameter signify the string from which the whitespace and predefined characters from left and right are to be removed.
$charlist
This is an optional parameter which specifies the characters that are to be removed from the string. If this is not mentioned then all of the following characters will be removed.
“” – NULL “t” – tab “n” – new line “x0B” – vertical tab “r” – carriage return ” ” – ordinary white space
Return Value
It returns the modified string by removing the whitespace and also the predefined characters from both sides of a string that is left and right.
Moving on with this article on Trim Function In PHP
PHP Ltrim Function
The ltrim() function is a built-in function in PHP which removes whitespaces or other characters from the left side of a string.
ltrim($string,$charlist)
Parameters
The function ltrim() accepts two parameters as shown in the above syntax. Out of these two parameters, one is mandatory while the other one is optional. They are discussed in details below:
$string
This mandatory parameter specifies the string to be checked.
$charlist
This optional parameter specifies which characters are to be removed from the string . In case, this parameter is not provided, the following characters are removed .
“” – NULL “t” – tab “n” – new line “x0B” – vertical tab
“r” – carriage return ” “ – ordinary white space
Return Value
Returns the modified string.
Sample Program
This program shows the use of ltrim() function without any specified list of characters to be removed.
<?php $string = "time for edureka"; echo "Subsidize ".ltrim($string); ?>
Output
Subsidize time for edureka
Sample Program
This program shows the use of ltrim() function with a specified list of characters to be removed.
<?php $string = "!!! (( !!)) time for edureka"; echo ltrim($string, "! ()"); ?>
Output
Time for edureka
Moving on with this article on Trim Function In PHP
PHP Rtrim Function
The rtrim() function is a built-in function in PHP which removes whitespaces or other characters (if specified) from the right side of a string.
Syntax
rtrim( $string, $charlist )
Parameters
The function rtrim() accepts two parameters as shown in the above syntax. Out of these two parameters, one is mandatory while the other one is optional.
$string
This mandatory parameter specifies the string to be checked.
$charlist
This optional parameter specifies which characters are to be removed from the string. In case, this parameter is not provided, the following characters are removed :
“” – NULL “t” – tab “n” – new line “x0B” – vertical tab “r” – carriage return ” “ – ordinary white space
Return Value
Returns the modified string.
Sample Program
This program shows the use of rtrim() function without any specified list of characters to be removed.
<?php $string = “ Time for "; echo rtrim($string)." edureka"; ?>
Output
Time for edureka
Sample Program
This program shows the use of rtrim() function with a specified list of characters to be removed.
<?php $string = "Time for !!! (( !!))"; echo rtrim($string, "! ()")." Edureka "; ?>
Output
Time for Edureka
Parameters
string It is used to specifies string to check
charlist It specifies which character to remove
Remove whitespaces from both sides of a string:
<?php$str="HelloWorld!";echo"Withouttrim:".$str;echo"<br>";echo"With trim:" . trim($str);?>
Output
<!DOCTYPE html> <html> <body>
Without trim: Hello World! <br>With trim: Hello World! </body> </html>
Now with this, we have come to the end of the Trim Function In PHP article. I Hope you guys enjoyed this article and understood the concepts of PHP. So, with the end of this PHP Tutorial, you are no longer a newbie to the scripting language.
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