Given a string and a word/substring, and we have to check whether a given word/substring exists in the string.

給定一個字符串和一個單詞/子字符串，我們必須檢查字符串中是否存在給定的單詞/子字符串。

PHP code to check substring in the string

PHP代碼檢查字符串中的子字符串

<?php//function to find the substring Position //if substring exists in the string function findMyWord($s, $w) {if (strpos($s, $w) !== false) {echo 'String contains ' . $w . '<br/>';} else {echo 'String does not contain ' . $w . '<br/>';} }//Run the function findMyWord('The Quick brown fox jumps right over the Lazy Dog', 'fox'); findMyWord('The Quick brown fox jumps right over the Lazy Dog', 'hello'); ?>

Output

輸出量

String contains fox String does not contain hello

Explanation:

說明：

To check if a string contains a word (or substring) we use the PHP strpos() function. We check if the word ($w) is present in the String ($s). Since strpos() also returns non-Boolean value which evaluates to false, We have to check the condition to be explicit !== false (Not equal to False) Which ensures that we get a more reliable response.

要檢查字符串是否包含單詞(或子字符串)，我們使用PHP strpos()函數。 我們檢查單詞( $ w )是否存在于字符串( $ s )中。 由于strpos()還返回非布爾值，該值的計算結果為false，因此我們必須檢查條件是否為顯式！== false(不等于False)，這確保我們獲得更可靠的響應。

翻譯自: https://www.includehelp.com/php/check-whether-a-specific-word-substring-exists-in-a-string.aspx

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