imagesx

(PHP 4, PHP 5)

imagesx — 画像の幅を取得する

説明

int imagesx ( resource $image )

指定した画像リソース image の幅を返します。

パラメータ

image: imagecreatetruecolor() のような画像作成関数が返す画像リソース。

返り値

image の幅、あるいはエラー時に FALSE を返します。

例

例1 imagesx() の使用法


<?php

// 300*200 の画像を作成します
$img = imagecreatetruecolor(300, 200);

echo imagesx($img); // 300

?>

参考

imagecreatetruecolor() - TrueColor イメージを新規に作成する
getimagesize() - 画像の大きさを取得する
imagesy() - 画像の高さを取得する

imagesy

imagestringup

Last updated: Fri, 13 Nov 2009

add a note User Contributed Notes
imagesx

kris
23-Sep-2004 12:49


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
27-Aug-2004 06:38


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'.

leonardo AT saochico DOT com
21-Nov-2003 03:24


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]);

?>

add a note

imagesy

imagestringup

Last updated: Fri, 13 Nov 2009