php - PHP中的startsWith（）和endsWith（）函数(startsWith() and endsWith() functions in PHP)

Question

How can I write two functions that would take a string and return if it starts with the specified character/string or ends with it?

(我如何编写两个带字符串的函数，如果它以指定的字符/字符串开头或以它结尾，则返回？)

For example:

(例如：)

$str = '|apples}';

echo startsWith($str, '|'); //Returns true
echo endsWith($str, '}'); //Returns true

  ask by Click Upvote translate from so

Answer 1

function startsWith($haystack, $needle)
{
     $length = strlen($needle);
     return (substr($haystack, 0, $length) === $needle);
}

function endsWith($haystack, $needle)
{
    $length = strlen($needle);
    if ($length == 0) {
        return true;
    }

    return (substr($haystack, -$length) === $needle);
}

Use this if you don't want to use a regex.

(如果您不想使用正则表达式，请使用此选项。)