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How to convert php string to html

Sep 02, 2021 am 09:46 AM
php string

php string转为html的方法:1、通过htmlentities()将字符串中特殊字符转化为html实体;2、通过htmlspecialchars()函数将字符串中特殊字符转化为html实体。

How to convert php string to html

本文操作环境:Windows7系统、PHP7.1版本、Dell G3电脑

php string怎么转为html?

PHP中字符串与html相互转化函数

在一般通信过程中,可能会遇到文档文本编码中所不包括很多字符,或者无法在键盘上输入的字符。例如,版权符号(©)、分币符号(¢)和语法重音符号等就属于这种字符。为了克服这些缺点,专门设计了一组统一的按键编码,称为字符实体引用。

1,htmlentities(),将字符串中特殊字符转化为html实体。

 string htmlentities(string $str,int $quote_style,int $charset,boolean $double_encode),因为标记中引号有特殊意义,可以通过$quote_style参数来选择如何处理引号,其值:ENT_COMPAT,转换双引号,忽略单引号,这是默认值;ENT_NOQUOTES,忽略双引号和单引号;ENT_QUOTES,转换双引号和单引号。$charset参数确定转换所用字符集,如果忽略charset,默认认为ISO-8859-1。$double_encode会阻止htmlentities()对字符串中已有的HTML实体编码。

如:

<?php
$str = "Bill & &#39;Steve&#39;";
echo htmlentities($str, ENT_COMPAT); // 只转换双引号
echo "<br>";
echo htmlentities($str, ENT_QUOTES); // 转换双引号和单引号
echo "<br>";
echo htmlentities($str, ENT_NOQUOTES); // 不转换任何引号
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输出:

Bill & 'Steve'
Bill & 'Steve'
Bill & 'Steve'

页面源代码是:

Bill &amp; &#39;Steve&#39;<br>Bill &amp; &#039;Steve&#039;<br>Bill &amp; &#39;Steve&#39;
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<?php
$str = "Bill & &#39;Steve&#39;";
echo html_entity_decode($str, ENT_COMPAT); // 只转换双引号
echo "<br>";
echo html_entity_decode($str, ENT_QUOTES); // 转换双引号和单引号
echo "<br>";
echo html_entity_decode($str, ENT_NOQUOTES); // 不转换任何引号
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输出:Bill & &#39;Steve&#39;Bill & &#39;Steve&#39;Bill & &#39;Steve&#39;页面源代码是:
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Bill & &#039;Steve&#039;<br>Bill & &#39;Steve&#39;<br>Bill & &#039;Steve&#039;
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2,htmlspecialchars()函数,将字符串中特殊字符转化为html实体。

string htmlspecialchars(string $str,int $quote_style,int $charset,boolean $double_encode),参数与htmlentities()函数中参数类似。

如:

<?php
$str = "This is some <b>bold</b> text";
$str1 = htmlspecialchars($str);
echo $str."<br/>";
echo $str1;
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输出:

This is some bold text
This is some bold text

源代码如下:

This is some <b>bold</b> text<br/>This is some &lt;b&gt;bold&lt;/b&gt; text
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htmlspecialchars()函数可以转换的字符列表以及最终转换格式如下:&=>&amp;"(双引号)=>&quot;&#39;(单引号)=>&#039;<=>&lt;>=>&gt;注:要防止用户向一个交互式web应用程序中输入HTML标签,这个函数尤为有用。以下例子使用htmlspecialchars()来转换可能有害的字符:
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<?php
$input = "I just can&#39;t get <<enough>> of PHP!";
echo htmlspecialchars($input);
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其反函数是htmlspecialchars_decode(),htmlspecialchars_decode(string $str,int $flag),$flags规定翻译表将包含哪种引号以及翻译表用于哪种文档类型,默认是ENT_COMPAT | ENT_HTML401

如:

<?php
$str = "This is some <b>bold</b> text.";
$str1 = htmlspecialchars_decode($str);
echo $str."<br/>",$str1;
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输出:

This is some bold text.
This is some bold text.

源代码:

This is some &lt;b&gt;bold&lt;/b&gt; text.<br/>This is some <b>bold</b> text.
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3,strip_tags()函数,从字符串中移除空字符,HTML和PHP标记,将html转化为纯文本。

string strip_tags(string $str,string $allowable_tags) 

$str,待处理字符串,$allowable_tags指定不被去除的字符列表。

如:

<?php
$text  =  &#39;<p>Test paragraph.</p><!-- Comment --> <a href="#fragment">Other text</a>&#39; ;
echo  strip_tags ( $text );
echo  "\n" ;

// 允许 <p> 和 <a>
echo  strip_tags ( $text ,  &#39;<p><a>&#39; );
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输出:

4,get_html_translation_table()函数,返回使用htmlspecialchars()和htmlentities()后的转换表。

array get_html_translation_table(int $table,int $flags,string $encoding),$table表示想要的表,分别是HTML_ENTITIES,HTML_SPECIALCHARS。$flags规定翻译表将包含哪种引号以及翻译表用于哪种文档类型,默认是ENT_COMPAT | ENT_HTML401$encoding一个规定了要使用的字符集的字符串,默认是ISO-8859-1。

如:

<?php
var_dump ( get_html_translation_table ( HTML_ENTITIES ,  ENT_QUOTES  |  ENT_HTML5 ));
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输出:

5,阿萨德

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