如何检查数组中包含HTML字符的条目? [英] How do I check an array for an entry that contains HTML characters?

问题描述

我有一个数组，表示以HTML字符串表示的希腊字母:

I have an array representing the Greek alphabet represented as HTML character strings:

$alphabet = ["α", "β", "γ", "δ", ...]

类似的字符串变量存储在MySQL数据库中，并从其中检索(我正在使用 mysqli ).当我从数据库中检索变量 $ db_result 的值时，例如，它的值是& alpha;" 并检查其是否在 $ alphabet 数组使用 in_array()函数，但是从未找到:

Similar string variables are stored in, and retrieved from, a MySQL database (I'm using mysqli). When I retrieve a variable $db_result whose value is, say, "α" from the DB and check to see if it's in the $alphabet array using the in_array() function, however, it's never found:

if( in_array($db_result, $alphabet) ){
    print_r("That's Greek to me!");
}
/* Result: Nothing ever prints */

如果我 print_r()和 $ db_result 和 $ alphabet 都打印相同的字符.也就是说， $ db_result 打印为'α'和 $ alphabet 打印为 Array([0] =>& alpha; [1] =>& beta; [2] =>& gamma; ...).

If I print_r() both $db_result and $alphabet, they both print the same characters. That is, $db_result prints as 'α' and $alphabet prints as Array ( [0] => α [1] => β [2] => γ ...).

在页面源中， $ db_resul t值显示为实际的希腊字母，而 $ alphabet 数组条目为HTML & alpha; .我并不关心显示，而是逻辑:我需要 in_array()来将alpha识别为alpha

In the page source, the $db_result values show up as actual Greek letters, while the $alphabet array entries are HTML α. I don't care about the display so much as the logic: I need in_array() to recognize alpha as alpha

从数据库中检索到值& alpha;" 后，编码方面必须有所不同，但我不知道该如何解决.

Something must differ about the encoding once the value "α" is retrieved from the DB, but I don't know what or how to fix it.

推荐答案

数据库结果为实际字符，因此将其转换为HTML实体以进行检查:

The database result is the actual character, so convert it to the HTML entity to check:

if( in_array(htmlentities($db_result), $alphabet) ){
    print_r("That's Greek to me!");
}

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