php - 如何检查字符串是否包含特定单词？(How do I check if a string contains a specific word?)

Question

Consider:

(考虑：)

$a = 'How are you?';

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

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

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

  ask by community wiki translate from so

Answer 1

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

(您可以使用strpos()函数来查找另一个字符串中另一个字符串的出现：)

$a = 'How are you?';

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

Note that the use of !== false is deliberate (neither != false nor === true will return the desired result);

(注意， !== false的使用是有意的（ != false或=== true都不会返回期望的结果）。)

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.

(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 。)

Since 0 is a valid offset and 0 is "falsey", we can't use simpler constructs like !strpos($a, 'are') .

(由于0是一个有效的偏移量，而0是“ falsey”，我们不能使用更简单的结构，例如!strpos($a, 'are') 。)