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php crc32 计算字符串的 32 位 CRC(循环冗余校验),crc32crc
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php crc32 计算字符串的 32 位 CRC(循环冗余校验),crc32crc

Jun 13, 2016 am 08:45 AM
crc php Bit redundancy string cycle check of calculate

php crc32 计算字符串的 32 位 CRC(循环冗余校验),crc32crc

注:本文转载 http://www.manongjc.com/article/499.html

 

php crc32函数用于生成字符串的 32 位循环冗余校验码多项式。这通常用于检查传输的数据是否完整。本文章向大家介绍php crc32函数的基本语法及使用实例。需要的码农可以参考一下。

crc32函数计算一个字符串的 crc32 多项式

 

crc32函数基本语法

int <span>crc32</span> ( <span>string</span> <span>$str</span> )
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生成 str 的 32 位循环冗余校验码多项式。这通常用于检查传输的数据是否完整。

提示:为了确保从 crc32() 函数中获得正确的字符串表示,您需要使用 printf() 或 sprintf() 函数的 %u 格式符。如果未使用 %u 格式符,结果可能会显示为不正确的数字或者负数。

crc32参数介绍

参数描述
string 必需。要校验的数据。

crc32返回值

返回 str crc32 校验的整数。

crc32函数实例:

示例中的第二行演示了如何使用 printf() 函数转换校验码:

<?<span>php
 </span><span>$checksum</span>  =  <span>crc32</span> ( "The quick brown fox jumped over the lazy dog."<span> );
 </span><span>printf</span> ( "%u\n" ,  <span>$checksum</span><span> );
</span>?> 
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在线运行

运行结果:

2191738434
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