PHP 5.6.0 released

imagesx

(PHP 4, PHP 5)

imagesxRetourne la largeur d'une image

Description

int imagesx ( resource $image )

Retourne la largeur de l'image référencée par image.

Liste de paramètres

image

Une ressource d'image, retournée par une des fonctions de création d'images, comme imagecreatetruecolor().

Valeurs de retour

Retourne la largeur de l'image image ou FALSE si une erreur survient.

Exemples

Exemple #1 Exemple avec imagesx()

<?php

// Création d'une image 300*200 image
$img imagecreatetruecolor(300200);

echo 
imagesx($img); // 300

?>

Voir aussi

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User Contributed Notes 3 notes

up
5
leonardo AT saochico DOT com
10 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]);
?>
up
-1
kris
9 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.
up
-1
anC
10 years ago
You can't convert pixels into centimeters or something else, atleast without knowing the resolution and the size of your screen and the viewrange of it. For example: The pixels on monitor that's resolution is 1024*768 and size is 17' the size of a pixel is smaller than on the monitor that's resolution is 1024*768 too but size is 21'.
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