这个问题已经有很多答案，但在某些情况下，你可以选择比所有答案都简单的答案。如果要查找的字符串是已知的（硬编码的），则可以使用正则表达式而不使用任何引号等。

检查字符串是否以“ABC”开头：

preg_match('/^ABC/', $myString); // "^" here means beginning of string

以“ABC”结尾：

preg_match('/ABC$/', $myString); // "$" here means end of string

在我的简单示例中，我想检查字符串是否以斜杠结尾：

preg_match('#/$#', $myPath);   // Use "#" as delimiter instead of escaping slash

优点：由于它非常简短和简单，您不必像上面所示那样定义函数（例如endsWith（））。

但是，这并不是每一种情况的解决方案，只是一种非常具体的解决方案。

您可以使用substra_compare函数检查开头和结尾：

function startsWith($haystack, $needle) {
    return substr_compare($haystack, $needle, 0, strlen($needle)) === 0;
}
function endsWith($haystack, $needle) {
    return substr_compare($haystack, $needle, -strlen($needle)) === 0;
}

这应该是PHP7（基准脚本）上最快的解决方案之一。在8KB的干草堆、各种长度的针以及完全、部分和不匹配的情况下进行测试。strncmp是一种更快的开始方式，但它不能检查结束方式。

Fastest endsWith（）解决方案：

# Checks if a string ends in a string
function endsWith($haystack, $needle) {
    return substr($haystack,-strlen($needle))===$needle;
}

基准：

# This answer
function endsWith($haystack, $needle) {
    return substr($haystack,-strlen($needle))===$needle;
}

# Accepted answer
function endsWith2($haystack, $needle) {
    $length = strlen($needle);

    return $length === 0 ||
    (substr($haystack, -$length) === $needle);
}

# Second most-voted answer
function endsWith3($haystack, $needle) {
    // search forward starting from end minus needle length characters
    if ($needle === '') {
        return true;
    }
    $diff = \strlen($haystack) - \strlen($needle);
    return $diff >= 0 && strpos($haystack, $needle, $diff) !== false;
}

# Regex answer
function endsWith4($haystack, $needle) {
    return preg_match('/' . preg_quote($needle, '/') . '$/', $haystack);
}

function timedebug() {
    $test = 10000000;

    $time1 = microtime(true);
    for ($i=0; $i < $test; $i++) {
        $tmp = endsWith('TestShortcode', 'Shortcode');
    }
    $time2 = microtime(true);
    $result1 = $time2 - $time1;

    for ($i=0; $i < $test; $i++) {
        $tmp = endsWith2('TestShortcode', 'Shortcode');
    }
    $time3 = microtime(true);
    $result2 = $time3 - $time2;

    for ($i=0; $i < $test; $i++) {
        $tmp = endsWith3('TestShortcode', 'Shortcode');
    }
    $time4 = microtime(true);
    $result3 = $time4 - $time3;

    for ($i=0; $i < $test; $i++) {
        $tmp = endsWith4('TestShortcode', 'Shortcode');
    }
    $time5 = microtime(true);
    $result4 = $time5 - $time4;

    echo $test.'x endsWith: '.$result1.' seconds # This answer<br>';
    echo $test.'x endsWith2: '.$result4.' seconds # Accepted answer<br>';
    echo $test.'x endsWith3: '.$result2.' seconds # Second most voted answer<br>';
    echo $test.'x endsWith4: '.$result3.' seconds # Regex answer<br>';
    exit;
}
timedebug();

基准结果：

10000000x endsWith: 1.5760900974274 seconds # This answer
10000000x endsWith2: 3.7102129459381 seconds # Accepted answer
10000000x endsWith3: 1.8731069564819 seconds # Second most voted answer
10000000x endsWith4: 2.1521229743958 seconds # Regex answer

您可以为此使用fnmatch函数。

// Starts with.
fnmatch('prefix*', $haystack);
// Ends with.
fnmatch('*suffix', $haystack);

到目前为止，所有的答案似乎都做了大量不必要的工作、strlen计算、字符串分配（substr）等。“strpos”和“stripos”函数返回$haystack中$needle第一次出现的索引：

function startsWith($haystack,$needle,$case=true)
{
    if ($case)
        return strpos($haystack, $needle, 0) === 0;

    return stripos($haystack, $needle, 0) === 0;
}

function endsWith($haystack,$needle,$case=true)
{
    $expectedPosition = strlen($haystack) - strlen($needle);

    if ($case)
        return strrpos($haystack, $needle, 0) === $expectedPosition;

    return strripos($haystack, $needle, 0) === $expectedPosition;
}

我会这样做

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

  function endWith($haystack,$needle){
              if(substr($haystack, -strlen($needle))===$needle)
              return true;
        }