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PHP – Check if a number is Even, Odd, or multiple of another

Posted on March 17, 2022 by ioadmin

While coding PHP applications, there are times when we need to check if a number is even, odd, or multiple of another.

Here are a few methods to do the same.

Method 1:

$number = 3;
if($number & 1){
    echo 'Odd number!';
}else{
    echo 'Even number!';
}

Method 2:

$number = 3;
if($number % 2){
    echo 'Odd number!';
}else{
    echo 'Even number!';
}

Method 3:

$number = 3;
echo ($number % 2 ? 'Even' : 'Odd');

Method 4:

Check if the number is multiple of another. This can be used to float DIV elements and remove margin from the last ones.

for ($i=1; $i <= 10; $i++) {
	if($i % 2){
		echo $i.' is not multiple of 2';
	}else{
		echo $i.' is multiple of 2';
	}
	echo '<br />'; // Adds a line break.
}

If you know of another method, do share these in the comments.

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Change WordPress Excerpt Length

Posted on February 24, 2022 by ioadmin

You can add the following code in your theme’s functions.php file to change the WordPress excerpt length. Change the number (100) to the desired length.

add_filter('excerpt_length', 'new_excerpt_length');
function new_excerpt_length($length) { return 100; }

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How-to: Get Current Url in PHP with or without Query String

Posted on February 22, 2022 by ioadmin

In each PHP website, we need to find out the current URL of the page, and here’s the PHP code to find out the current URL of the page a user is browsing with or without the query string.

function currentUrl( $trim_query_string = false ) {
    $pageURL = (isset( $_SERVER['HTTPS'] ) && $_SERVER['HTTPS'] == 'on') ? "//" : "//";
    $pageURL .= $_SERVER["SERVER_NAME"] . $_SERVER["REQUEST_URI"];
    if( ! $trim_query_string ) {
        return $pageURL;
    } else {
        $url = explode( '?', $pageURL );
        return $url[0];
    }
}

I like to keep such functions in a helpers class so I can use them anywhere in the app. To use it in a PHP class you can use the following code:

public function currentUrl( $trim_query_string = false ) {
    $pageURL = (isset( $_SERVER['HTTPS'] ) && $_SERVER['HTTPS'] == 'on') ? "//" : "//";
    $pageURL .= $_SERVER["SERVER_NAME"] . $_SERVER["REQUEST_URI"];
    if( ! $trim_query_string ) {
        return $pageURL;
    } else {
        $url = explode( '?', $pageURL );
        return $url[0];
    }
}