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常见的PHP 10个字符串处理实例代码

Jun 06, 2016 pm 07:56 PM
php code deal with string Example common Enter

欢迎进入Linux社区论坛,与200万技术人员互动交流 >>进入 1.确定一个字符串的长度 这是文章中最明显的一个例子,其中的问题是我们如何来确定一个字符串的长度,这里我们不能不提的就是strlen()函数: $text = "sunny day"; $count = strlen($text); // $coun

欢迎进入Linux社区论坛,与200万技术人员互动交流 >>进入

   1.确定一个字符串的长度

   这是文章中最明显的一个例子,其中的问题是我们如何来确定一个字符串的长度,这里我们不能不提的就是strlen()函数:

   $text = "sunny day"; $count = strlen($text); // $count = 9

   2.截取文本,创建一个摘要

   新闻性质的网站通常会截取一个大约200字左右的段落,并在次段落的末尾加上省略号来形成一个摘要,这时,你可以使用substr_replace()函数来实现此功能。由于篇幅的原因,这里只演示对40个字符的限制:

   $article = "BREAKING NEWS: In ultimate irony, man bites dog."; $summary = substr_replace($article, "...", 40); // $summary = "BREAKING NEWS: In ultimate irony, man bi..."

   3.计算字符串中的字符和单词数

   相信您经常会看到一些博客或者新闻类文章,来总结文章的总字数,或者我们也经常看到一些投稿的要求:在一定的字数范围内。这时,你可以使用str_word_count()函数来计算文章字数的总和:

   $article = "BREAKING NEWS: In ultimate irony, man bites dog."; $wordCount = str_word_count($article); // $wordCount = 8

   有的时候你需要更加严格的控制投稿者的使用空间,例如一些批注等等。如果你想知道有多少个字符来组成一个数组,请使用count_chars()函数。

   4.解析CSV文件

   数据通常是以逗号分隔的形式存储在文件中的(如一个已知的CSV文件),CSV文件使用一个逗号或者类似于预定义符号,将每列字符串组成一个单独的行。你可能经常创建PHP脚本来导入这些数据,或者解析出你所需要的东西,这些年来,我也看到过很多解析CSV文件的方法,最常见的就是使用fgets()和explode()函数的组合来读取和解析文件,然而,最简单的方法是使用一个函数来解决问题,但它并不属于PHP的字符串处理库里的一部分:fgetcsv()函数。使用fopen()和fgetcsv()函数,我们能够很容易的解析这个文件,同时检索出每个联系人的名字:

   $fh = fopen("contacts.csv", "r"); while($line = fgetcsv($fh, 1000, ",")) { echo "Contact: {$line[1]}"; }

   5.转换成一个字符串数组

   某些时候,你可能需要创建CSV文件,同时又在这些文件中进行读取,这就意味着你需要将那些同逗号分隔的字符串转换成数据。如果这些数据最初是从数据库检索出的,那么它很可能会只给您提供一个数组。这时,您可以使用implode()函数,将这些字符串转换成一个数组:

   $csv = implode(",", $record);

   6.将网址转换成超链接

   目前许多WYSIWYG编辑器提供的工具栏,都允许用户标记文本,包括超链接。但是,当内容呈现到页面上时,你可以很容易的自动执行此过程,同时保证您不出现额外的错误。要转换成超链接的URL,你可以使用preg_replace()函数,它可以按照正则表达式来搜索一个字符串,并定义了URL的结构:

   $url = "W.J. Gilmore, LLC (http://www.xker.com)"; $url = preg_replace("/http://([A-z0-9./-]+)/", "$0", $url); // $url = "W.J. Gilmore, LLC (http://www.xker.com)"

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常见的PHP 10个字符串处理实例代码

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