Apakah langkah-langkah untuk memangkas imej dalam php

Langkah-langkah untuk memangkas imej dalam PHP: 1. Buat fail contoh PHP 2. Gunakan kaedah "function imageCropper(){...}" untuk mencapai pemangkasan invarian imej 3. Gunakan "function imageZoom(; ){ ...}" kaedah boleh digunakan untuk memangkas imej secara berkadar.

Persekitaran pengendalian artikel ini: sistem Windows 7, PHP versi 7.4, komputer DELL G3

Apakah langkah-langkah untuk memotong gambar dengan PHP?

Cara melaksanakan pemangkasan invarian imej dan pemotongan berkadar imej dengan PHP

Artikel ini menerangkan contoh PHP melaksanakan pemotongan invarian imej dan pemotongan berkadar imej. Kongsi dengan semua orang untuk rujukan anda, butirannya adalah seperti berikut:

Gambar pemangkasan tidak berubah

<?php
/**
 * imageCropper
 * @param string $source_path
 * @param string $target_width
 * @param string $target_height
 */
function imageCropper($source_path, $target_width, $target_height){
  $source_info  = getimagesize($source_path);
  $source_width = $source_info[0];
  $source_height = $source_info[1];
  $source_mime  = $source_info[&#39;mime&#39;];
  $source_ratio = $source_height / $source_width;
  $target_ratio = $target_height / $target_width;
  if ($source_ratio > $target_ratio){
    // image-to-height
    $cropped_width = $source_width;
    $cropped_height = $source_width * $target_ratio;
    $source_x = 0;
    $source_y = ($source_height - $cropped_height) / 2;
  }elseif ($source_ratio < $target_ratio){
    //image-to-widht
    $cropped_width = $source_height / $target_ratio;
    $cropped_height = $source_height;
    $source_x = ($source_width - $cropped_width) / 2;
    $source_y = 0;
  }else{
    //image-size-ok
    $cropped_width = $source_width;
    $cropped_height = $source_height;
    $source_x = 0;
    $source_y = 0;
  }
  switch ($source_mime){
    case &#39;image/gif&#39;:
      $source_image = imagecreatefromgif($source_path);
      break;
    case &#39;image/jpeg&#39;:
      $source_image = imagecreatefromjpeg($source_path);
      break;
    case &#39;image/png&#39;:
      $source_image = imagecreatefrompng($source_path);
      break;
    default:
      return ;
      break;
  }
  $target_image = imagecreatetruecolor($target_width, $target_height);
  $cropped_image = imagecreatetruecolor($cropped_width, $cropped_height);
  // copy
  imagecopy($cropped_image, $source_image, 0, 0, $source_x, $source_y, $cropped_width, $cropped_height);
  // zoom
  imagecopyresampled($target_image, $cropped_image, 0, 0, 0, 0, $target_width, $target_height, $cropped_width, $cropped_height);
  header(&#39;Content-Type: image/jpeg&#39;);
  imagejpeg($target_image);
  imagedestroy($source_image);
  imagedestroy($target_image);
  imagedestroy($cropped_image);
}
$filename = "8fcb7a0831b79c61.jpg";
imageCropper($filename,200,200);
?>

Gambar dipangkas secara proporsional

<?php
/**
 * imageZoom
 * @param string $file
 * @param double $zoom
 */
function imageZoom($filename,$zoom=0.6){
  //baseinfo
  $sourceImageInfo = getimagesize($filename);
  $sourceWidth = $sourceImageInfo[0];
  $sourceHeight = $sourceImageInfo[1];
  $sourceMine = $sourceImageInfo[&#39;mime&#39;];
  $sourceRatio = $sourceWidth/$sourceHeight;
  $sourceX = 0;
  $sourceY = 0;
  //zoom
  $targetRatio = $zoom;
  //target-widht-height
  $targetWidth = $sourceWidth*$targetRatio;
  $targetHeight = $sourceHeight*$targetRatio;
  //init-params
  $sourceImage = null;
  switch($sourceMine){
    case &#39;image/gif&#39;:
      $sourceImage = imagecreatefromgif($filename);
      break;
    case &#39;image/jpeg&#39;:
      $sourceImage = imagecreatefromjpeg($filename);
      break;
    case &#39;image/png&#39;:
      $sourceImage = imagecreatefrompng($filename);
      break;
    default:
      return ;
      break;
  }
  //temp-target-image
  $tempSourceImage = imagecreatetruecolor($sourceWidth, $sourceHeight);
  $targetImage = imagecreatetruecolor($targetWidth,$targetHeight);
  //copy
  imagecopy($tempSourceImage, $sourceImage, 0, 0, $sourceX, $sourceY, $sourceWidth, $sourceHeight);
  //zoom
  imagecopyresampled($targetImage, $tempSourceImage, 0, 0, 0, 0, $targetWidth, $targetHeight, $sourceWidth, $sourceHeight);
  //header
  header(&#39;Content-Type: image/jpeg&#39;);
  //image-loading
  imagejpeg($targetImage);
  //destroy
  imagedestroy($tempSourceImage);
  imagedestroy($sourceImage);
  imagedestroy($targetImage);
}
$filename = "8fcb7a0831b79c61.jpg";
imageZoom($filename);
?>

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