init函数的支持,本文实例讲述了PHP实现图片不变

2019-07-13 作者:编程   |   浏览(161)

正文实例分析了CodeIgniter配置之autoload.php自动加载用法。分享给我们供我们仿效,具体如下:

本文汇报了PHP简单开启curl的点子。分享给我们供大家参照他事他说加以考察,具体如下:

正文实例陈述了PHP达成图片不转换裁剪及图片按百分比裁剪的不二等秘书诀。分享给大家供我们参谋,具体如下:

正文实例解析了PHP的mysql事务难题。共享给大家供大家参谋,具体如下:

CodeIgniter带了机动加载的功力,能够全局加载类库、模型、配置、语言包等,对于必要全局使用的遵循十三分有益。

一、问题:

图形不成形裁剪

对此myisam数据库,能够操纵作业的开始展览:

举个例子:有个全局函数写在app_helper.php中,须要全局加载这么些函数,只需设置autoload.php:

windows主机现身“Call to undefined function curl_init”错误提示,未有定义的函数,约等于php还没张开对curl_init函数的支撑。

<?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['mime'];
  $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 'image/gif':
      $source_image = imagecreatefromgif($source_path);
      break;
    case 'image/jpeg':
      $source_image = imagecreatefromjpeg($source_path);
      break;
    case 'image/png':
      $source_image = imagecreatefrompng($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, $cropped_height);
  header('Content-Type: image/jpeg');
  imagejpeg($target_image);
  imagedestroy($source_image);
  imagedestroy($target_image);
  imagedestroy($cropped_image);
}
$filename = "8fcb7a0831b79c61.jpg";
imageCropper($filename,200,200);
?>
$mysqlrl = mysql_connect ( $db_config ["host"], $db_config ["user"], $db_config ["pass"], true );
if (! $mysqlrl) {
    $msg = mysql_error ();
    die ( 'Could not connect: ' . $msg );
}
mysql_select_db ( $db_config ["data"], $mysqlrl ) or die ( "error: 数据库异常" );
mysql_query ( "SET NAMES 'utf8'" );
date_default_timezone_set ( 'Asia/Shanghai' );
/**
* 事务操作过程 BEGIN COMMIT END
*/
mysql_query ( 'BEGIN' );
$flag3 = mysql_query ( $sql3);
$flag1 = mysql_query ( $sql1);
$flag2 = mysql_query ( $sql2);  
    if ($flag1 && $flag1 && $flag3) {
    mysql_query ( 'COMMIT' );
    mysql_query ( 'END' );
    $data .= "rn" . "更新记录成功";
    write_file ( $file, $data );
    return true;
  } else {
    print mysql_error ();
    mysql_query ( 'ROLLBACK' );
    mysql_query ( 'END' );
    $data .= "rn" . "更新记录失败(⊙o⊙)!!!";
    write_file ( $file, $data );
    return false;
  }
}

复制代码 代码如下:

二、消除措施:

图形按比例裁剪

愈多关于PHP操作MySQL相关内容感兴趣的读者可查阅本站专项论题:《php mysql数据库操作入门教程》

$autoload['helper'] = array('app');

内需开启php的curl函数库。具体步骤如下:

<?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['mime'];
  $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 'image/gif':
      $sourceImage = imagecreatefromgif($filename);
      break;
    case 'image/jpeg':
      $sourceImage = imagecreatefromjpeg($filename);
      break;
    case 'image/png':
      $sourceImage = imagecreatefrompng($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, $sourceHeight);
  //header
  header('Content-Type: image/jpeg');
  //image-loading
  imagejpeg($targetImage);
  //destroy
  imagedestroy($tempSourceImage);
  imagedestroy($sourceImage);
  imagedestroy($targetImage);
}
$filename = "8fcb7a0831b79c61.jpg";
imageZoom($filename);
?>

盼望本文所述对我们PHP程序设计具备帮助。

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