如何检查字符串是否包含特定单词? [英] How do I check if a string contains a specific word?

问题描述

考虑:

$a = 'How are you?';

if ($a contains 'are')
    echo 'true';

假设我有上面的代码，写语句if ($a contains 'are')的正确方法是什么?

Suppose I have the code above, what is the correct way to write the statement if ($a contains 'are')?

推荐答案

您可以使用 strpos() 函数，用于查找另一个字符串中另一个字符串的出现:

You can use the strpos() function which is used to find the occurrence of one string inside another one:

$a = 'How are you?';

if (strpos($a, 'are') !== false) {
    echo 'true';
}

请注意，!== false的使用是有意的(!= false和=== true都不会返回期望的结果)； strpos()返回大海捞针字符串中针串开始的偏移量，或者如果找不到针，则返回布尔值false.由于0是有效偏移量，而0是假"，我们不能使用像!strpos($a, 'are')这样的更简单的构造.

Note that the use of !== false is deliberate (neither != false nor === true will return the desired result); strpos() returns either the offset at which the needle string begins in the haystack string, or the boolean false if the needle isn't found. Since 0 is a valid offset and 0 is "falsey", we can't use simpler constructs like !strpos($a, 'are').

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