php 한글 메뉴얼 도움말 검색 사이트 브라우저나 파일로 출력 이미지 [function.imagegif]

설명

bool imagegif ( resource $image [, string $filename ] )

imagegif() creates the GIF file in filename from the image image. The image argument is the return from the imagecreate() or imagecreatefrom* function.

The image format will be GIF87a unless the image has been made transparent with imagecolortransparent(), in which case the image format will be GIF89a.

인수

image: imagecreatetruecolor() 등의 이미지 생성 함수에서 반환한 이미지 자원.
filename: 저장할 파일 경로. 지정하지 않거나 NULL일 경우에는, raw 이미지 스트림을 직접 출력합니다.

반환값

성공 시 TRUE를, 실패 시 FALSE를 반환합니다.

예제

Example #1 Outputting an image using imagegif()


<?php
// Create a new image instance
$im = imagecreatetruecolor(100, 100);

// Make the background white
imagefilledrectangle($im, 0, 0, 99, 99, 0xFFFFFF);

// Draw a text string on the image
imagestring($im, 3, 40, 20, 'GD Library', 0xFFBA00);

// Output the image to browser
header('Content-Type: image/gif');

imagegif($im);
imagedestroy($im);
?>

Example #2 Converting a PNG image to GIF using imagegif()


<?php

// Load the PNG
$png = imagecreatefrompng('./php.png');

// Save the image as a GIF
imagegif($png, './php.gif');

// Free from memory
imagedestroy($png);

// We're done
echo 'Converted PNG image to GIF with success!';
?>

주의

Note:
GIF support was removed from the GD library in Version 1.6, and added back in Version 2.0.28. This function is not available between these versions. For more information, see the » GD Project site.

The following code snippet allows you to write more portable PHP applications by auto-detecting the type of GD support which is available. Replace the sequence header ("Content-Type: image/gif"); imagegif ($im); by the more flexible sequence:

<?php // Create a new image instance $im = imagecreatetruecolor(100, 100); // Do some image operations here // Handle output if(function_exists('imagegif')) { // For GIF header('Content-Type: image/gif'); imagegif($im); } elseif(function_exists('imagejpeg')) { // For JPEG header('Content-Type: image/jpeg'); imagejpeg($im, NULL, 100); } elseif(function_exists('imagepng')) { // For PNG header('Content-Type: image/png'); imagepng($im); } elseif(function_exists('imagewbmp')) { // For WBMP header('Content-Type: image/vnd.wap.wbmp'); imagewbmp($im); } else { imagedestroy($im); die('No image support in this PHP server'); } // If image support was found for one of these // formats, then free it from memory if($im) { imagedestroy($im); } ?>

Note:
As of PHP 4.0.2 you can use the function imagetypes() in place of function_exists() for checking the presence of the various supported image formats:

<?php if(imagetypes() & IMG_GIF) { header('Content-Type: image/gif'); imagegif($im); } elseif(imagetypes() & IMG_JPG) { /* ... etc. */ } ?>

참고

imagepng() - Output a PNG image to either the browser or a file
imagewbmp() - 브라우저나 파일로 출력 이미지
imagejpeg() - 브라우저나 파일로 출력 이미지
imagetypes() - Return the image types supported by this PHP build