如何在字符串的末尾搜索文本中存在的文本？

Question

For example I have this :

$string = 'PHP is a server side web programming language , PHP is amazing , I love PHP';

$array = array('html','css','javascript','ajax','html5','css3','jquery','PHP');

foreach($array as $ar){
   //Check if one of the $array values exists in the $string
}

I want to search from the end of the $string only , so if the $array value is not at the end then nothing would happen as it's not exist , The PHP could be any of the other values in the $array so I don't know the length the value should be found at , I mean the word could be repeated and with different length.

i.e : $string = 'html .... , html is fantastic , I love html'; , now the length of the word is bigger , and it could be bigger than that.

How to find the last one only what ever the length of the word is ?

Answer 1

Try using regex's closing anchor $ like this:

$string = 'PHP is a server side web programming language , PHP is amazing , I love PHP';

$array = ['html', 'css', 'javascript', 'ajax', 'html5', 'css3', 'jquery', 'PHP'];

foreach ($array as $ar) {
    // Check if one of the $array values exists in the $string
    if (preg_match("/$ar$/", $string)) {
        echo "Found $ar at the end of \$string";
        break;
    }
}

This outputs:

Found PHP at the end of $string

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