1. This is a thumbnail class library
It is an open source picture thumbnail class library that can complete a variety of complex picture thumbnail generation and reality, and is very convenient to use.
2. Usage
Here is a simple and practical explanation about it. The English is relatively simple and will not be translated:
Basic-Usage
3. API
Here is a list of APIs:
PHPThumb API
But it is a pity that there is no explanation in the API, you can only compare it Guess the effect of the English name. Of course, even if you guess it correctly, you still need to test it to see if it is correct.
4. Example
Here I also wrote a simple method to call it, but I saved the image as a file. The examples in basic-usage are all Output directly on the page:
require_once 'phpthumb/ThumbLib.inc.php';
try {
$thumb = PhpThumbFactory::create($realpath);
} catch (Exception $e) {
// handle error here however you'd like
}
$thumb->adaptiveResize($width, $height);
$thumb->save($realpath . '.' . $width . 'x' . $height . '.png');
5. Several APIs I used
During the use process, my understanding of several APIs gradually deepened. I will record them here:
resize ( $maxWidth, $maxHeight)
The resize method is the most commonly used thumbnail method. It directly reduces the largest side to the required height/width in equal proportions. When the image aspect ratio is inconsistent with the requirements, the There will be blank edges.
adaptiveResize ($width, $height)
The adaptiveResize method does not require the completeness of the image in some specific cases, but requires that the maximum content of a specific width and height be displayed. The specific calculation method is:
When the width of the picture is greater than the required width and the height is the same, take the height and go from the middle of the left and right sides of the picture to the required width;
When the height of the picture is larger and When the width is the same, go to the width and center the top and bottom of the image to obtain the required height;
When the width and height are incorrect, first scale the image to the required size, and then execute the first two steps.
save ($fileName, $format = 'GIF|JPG|PNG')
After the image is processed, you can use the save method to save the image as one of the codes indicated in format , if no encoding is specified, it will be saved in the original encoding. $fileName is the path to save.

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。

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。

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。

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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