imagesx

(PHP 4, PHP 5, PHP 7)

imagesx — Get image width

Description

int imagesx ( resource $image )

Returns the width of the given image resource.

Parameters

image: An image resource, returned by one of the image creation functions, such as imagecreatetruecolor().

Return Values

Return the width of the image or FALSE on errors.

Examples

Example #1 Using imagesx()


<?php

// create a 300*200 image
$img = imagecreatetruecolor(300, 200);

echo imagesx($img); // 300

?>

User Contributed Notes

leonardo AT saochico DOT com

12 years ago


This function convert image size of Pixel to Centimeter

<?
#$imagem - source of image
#$dpi - resolution to convert E.g.: 72dpi or 300dpi

function px2cm($image, $dpi) {
    #Create a new image from file or URL
    $img = ImageCreateFromJpeg($image);

    #Get image width / height
    $x = ImageSX($img);
    $y = ImageSY($img);
    
    #Convert to centimeter
    $h = $x * 2.54 / $dpi;
    $l = $y * 2.54 / $dpi;
    
    #Format a number with grouped thousands
    $h = number_format($h, 2, ',', ' ');
    $l = number_format($l, 2, ',', ' ');
    
    #add size unit
    $px2cm[] = $h."cm";
    $px2cm[] = $l."cm";
    
    #return array w values
    #$px2cm[0] = X
    #$px2cm[1] = Y    
    return $px2cm;
}

$image = "C:\\inetpub\\wwwroot\\lab\\trata_img\\l0gik.jpg";
$dpi = 300;

$result = px2cm($image, $dpi);

print ($result[0]." x ".$result[1]);
?>

kris

11 years ago


You can in fact convert pixels to CM or to whatever measurement you want if you know the DPI and current resolution of the image.  This will of course give you the real life print size of the image and not the actual on screen size of the image.  

This function seems to have been created for such a purpose.  It is for this reason the creator of the function passes the DPI and resolution to his function.

anC