


PHP realizes batch generation of App logos of various sizes, phpapp size logos
Use PHP GD, easy to use, cut various sizes with one click, package and download. Those who often change icons will know that the artist will give you a 1024 logo, and you have to photoshop it into various sizes, so we came up with this thing.
Core Code
复制代码 代码如下:
class image {
/**
* source image
*
* @var string|array
*/
private $source;
/**
* temporay image
*
* @var file
*/
private $image;
private $ext;
/**
* errors
*
* @var array
*/
private $error;
/**
* construct
*
* @param string|array $source
*/
public function __construct($source = NULL) {
if($source != NULL) {
$this->source($source);
}
}
/**
* set the source image
*
* @param string|array $source
*/
public function source($source) {
if(!is_array($source)) {
$this->source["name"] = $source;
$this->source["tmp_name"] = $source;
$type = NULL;
$ext = strtolower(end(explode(".",$source)));
switch($ext) {
case "jpg" :
case "jpeg" : $type = "image/jpeg"; break;
case "gif" : $type = "image/gif"; break;
case "png" : $type = "image/png"; break;
}
$this->source["type"] = $type;
} else {
$this->source = $source;
}
$this->destination = $this->source["name"];
}
/**
* resize the image
*
* @param int $width
* @param int $height
*/
public function resize($width = NULL,$height = NULL) {
if(isset($this->source["tmp_name"]) && file_exists($this->source["tmp_name"])) {
list($source_width,$source_height) = getimagesize($this->source["tmp_name"]);
if(($width == NULL) && ($height != NULL)) {
$width = ($source_width * $height) / $source_height;
}
if(($width != NULL) && ($height == NULL)) {
$height = ($source_height * $width) / $source_width;
}
if(($width == NULL) && ($height == NULL)) {
$width = $source_width;
$height = $source_height;
}
switch($this->source["type"]) {
case "image/jpeg" : $created = imagecreatefromjpeg($this->source["tmp_name"]); break;
case "image/gif" : $created = imagecreatefromgif($this->source["tmp_name"]); break;
case "image/png" : $created = imagecreatefrompng($this->source["tmp_name"]); break;
}
$this->image = imagecreatetruecolor($width,$height);
imagecopyresampled($this->image,$created,0,0,0,0,$width,$height,$source_width,$source_height);
}
}
/**
* add watermark on image
*
* @param string $mark
* @param int $opac
* @param int $x_pos
* @param int $y_pos
*/
public function watermark($mark,$opac,$x_pos,$y_pos) {
if(file_exists($mark) && ($this->image != "")) {
$ext = strtolower(end(explode(".",$mark)));
switch($ext) {
case "jpg" :
case "jpeg" : $watermark = imagecreatefromjpeg($mark); break;
case "gif" : $watermark = imagecreatefromgif($mark); break;
case "png" : $watermark = imagecreatefrompng($mark); break;
}
list($watermark_width,$watermark_height) = getimagesize($mark);
$source_width = imagesx($this->image);
$source_height = imagesy($this->image);
if($x_pos == "top") $pos = "t"; else $pos = "b";
if($y_pos == "left") $pos .= "l"; else $pos .= "r";
$dest_x = 0;
$dest_y = 0;
switch($pos) {
case "tr" : $dest_x = $source_width - $watermark_width; break;
case "bl" : $dest_y = $source_height - $watermark_height; break;
case "br" : $dest_x = $source_width - $watermark_width; $dest_y = $source_height - $watermark_height; break;
}
imagecopymerge($this->image,$watermark,$dest_x,$dest_y,0,0,$watermark_width,$watermark_height,$opac);
}
}
/**
* crop the image
*
* @param int $x
* @param int $y
* @param int $width
* @param int $height
*/
public function crop($x,$y,$width,$height) {
if(isset($this->source["tmp_name"]) && file_exists($this->source["tmp_name"]) && ($width > 10) && ($height > 10)) {
switch($this->source["type"]) {
case "image/jpeg" : $created = imagecreatefromjpeg($this->source["tmp_name"]); break;
case "image/gif" : $created = imagecreatefromgif($this->source["tmp_name"]); break;
case "image/png" : $created = imagecreatefrompng($this->source["tmp_name"]); break;
}
$this->image = imagecreatetruecolor($width,$height);
imagecopy($this->image,$created,0,0,$x,$y,$width,$height);
}
}
/**
* create final image file
*
* @param string $destination
* @param int $quality
*/
public function create($destination,$quality = 100) {
if($this->image != "") {
$extension = substr($destination,-3,3);
switch($extension) {
case "gif" :
imagegif($this->image,$destination,$quality);
break;
case "png" :
$quality = ceil($quality/10) - 1;
imagepng($this->image,$destination,$quality);
break;
default :
imagejpeg($this->image,$destination,$quality);
break;
}
}
}
/**
* check if extension is valid
*
*/
public function validate_extension() {
if(isset($this->source["tmp_name"]) && file_exists($this->source["tmp_name"])) {
$exts = array("image/jpeg", "image/pjpeg", "image/png", "image/x-png");
$ext = $this->source["type"];
$valid = 0;
$this->ext = '.not_found';
if ($ext == $exts[0] || $ext == $exts[1]) {
$valid = 1;
$this->ext = '.jpg';
}
// if ($ext == $exts[2]) {
// $valid = 1;
// $this->ext = '.gif';
// }
if ($ext == $exts[2] || $ext == $exts[3]) {
$valid = 1;
$this->ext = '.png';
}
if($valid != 1) {
$this->error .= "extension";
}
} else {
$this->error .= "source";
}
}
/**
* check if the size is correct
*
* @param int $max
*/
public function validate_size($max) {
if(isset($this->source["tmp_name"]) && file_exists($this->source["tmp_name"])) {
$max = $max * 1024;
if($this->source["size"] >= $max) {
$this->error .= "size";
}
} else {
$this->error .= "source";
}
}
/**
* check if the dimension is correct
*
* @param int $limit_width
* @param int $limit_height
*/
public function validate_dimension($limit_width,$limit_height) {
if(isset($this->source["tmp_name"]) && file_exists($this->source["tmp_name"])) {
list($source_width,$source_height) = getimagesize($this->source["tmp_name"]);
if(($source_width > $limit_width) || ($source_height > $limit_height)) {
$this->error .= "dimension";
}
} else {
$this->error .= "source";
}
}
/**
* get the found errors
*
*/
public function error() {
$error = array();
if(stristr($this->error,"source")) $error[] = "找不到上传文件";
if(stristr($this->error,"dimension")) $error[] = "上传图片尺寸太大";
if(stristr($this->error,"extension")) $error[] = "不符合要求的格式";
if(stristr($this->error,"size")) $error[] = "图片文件太大";
return $error;
}
public function error_string() {
$error = "";
if(stristr($this->error,"source")) $error .= "找不到上传文件 / ";
if(stristr($this->error,"dimension")) $error .= "上传图片尺寸太大 / ";
if(stristr($this->error,"extension")) $error .= "不符合要求的格式 / ";
if(stristr($this->error,"size")) $error .= "The picture file is too large / ";
If(eregi(" / $", $error)) {
$error = substr($error, 0, -3);
}
return $error;
}
Public function ext() {
return $this->ext;
}
}
That’s all the content of this article, I hope you all like it.

php把负数转为正整数的方法:1、使用abs()函数将负数转为正数,使用intval()函数对正数取整,转为正整数,语法“intval(abs($number))”;2、利用“~”位运算符将负数取反加一,语法“~$number + 1”。

实现方法:1、使用“sleep(延迟秒数)”语句,可延迟执行函数若干秒;2、使用“time_nanosleep(延迟秒数,延迟纳秒数)”语句,可延迟执行函数若干秒和纳秒;3、使用“time_sleep_until(time()+7)”语句。

php除以100保留两位小数的方法:1、利用“/”运算符进行除法运算,语法“数值 / 100”;2、使用“number_format(除法结果, 2)”或“sprintf("%.2f",除法结果)”语句进行四舍五入的处理值,并保留两位小数。

php字符串有下标。在PHP中,下标不仅可以应用于数组和对象,还可应用于字符串,利用字符串的下标和中括号“[]”可以访问指定索引位置的字符,并对该字符进行读写,语法“字符串名[下标值]”;字符串的下标值(索引值)只能是整数类型,起始值为0。

判断方法:1、使用“strtotime("年-月-日")”语句将给定的年月日转换为时间戳格式;2、用“date("z",时间戳)+1”语句计算指定时间戳是一年的第几天。date()返回的天数是从0开始计算的,因此真实天数需要在此基础上加1。

在php中,可以使用substr()函数来读取字符串后几个字符,只需要将该函数的第二个参数设置为负值,第三个参数省略即可;语法为“substr(字符串,-n)”,表示读取从字符串结尾处向前数第n个字符开始,直到字符串结尾的全部字符。

方法:1、用“str_replace(" ","其他字符",$str)”语句,可将nbsp符替换为其他字符;2、用“preg_replace("/(\s|\ \;||\xc2\xa0)/","其他字符",$str)”语句。

php判断有没有小数点的方法:1、使用“strpos(数字字符串,'.')”语法,如果返回小数点在字符串中第一次出现的位置,则有小数点;2、使用“strrpos(数字字符串,'.')”语句,如果返回小数点在字符串中最后一次出现的位置,则有。


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