确定字符串是否包含数字序列

Question

假设我有一个整数 88123401，我想确定它是否包含一个数字序列，例如 1234、23456、456789 等任意长度的数字序列。是这在 PHP 中是完全可能的，如果是这样，人们将如何找出答案？

Answer 1

将数字视为字符串并使用 strpos() 进行搜索。

示例：

$mystring = '88123401';
$findme   = '1234';
$pos = strpos($mystring, $findme);


if ($pos === false) {
    echo "The sequence '$findme' was not found in the number '$mystring'";
} else {
    echo "The sequence '$findme' was found in the number '$mystring'";
    echo " and exists at position $pos";
}

来源：http://php.net/manual/en/function.strpos.php

Answer 2

有些函数带有 for，因此您可以遍历所有字符串，将每个字符与其前身进行比较。

function doesStringContainChain($str, $n_chained_expected)
{
    $chained = 1;

    for($i=1; $i<strlen($str); $i++)
    {
        if($str[$i] == ($str[$i-1] + 1))
        {
            $chained++;
            if($chained >= $n_chained_expected)
                return true;
        }else{
            $chained = 1;
        }
    }
    return false;
}

doesStringContainChain("6245679",4); //true
doesStringContainChain("6245679",5); //false

Answer 3

使用循环并使用@jtheman

的答案

$mystring = '88123401';
$findme   = array(123,2345,34567);
foreach ( $findme as $findspecificnum ) {
    $pos = strpos($mystring, $findme);

    if ($pos === false) {
        echo "The sequence '$findme' was not found in the number '$mystring'";
    } else {
        echo "The sequence '$findme' was found in the number '$mystring'";
        echo " and exists at position $pos";
    }
}

保持简单直接。

Answer 4

这可能对您有帮助：

$number = "88123401";

$splittedNumbers = str_split($number);
$continuous = false;
$matches[0] = '';
$i = 0;

do {
    if ((int)(current($splittedNumbers) + 1) === (int)next($splittedNumbers)) {
        if($continuous) {
            $matches[$i] .= current($splittedNumbers);
        }
        else {
            $matches[$i] .= prev($splittedNumbers) . next($splittedNumbers);
            $continuous = true;
        }
    } else {
        $continuous = false;        
        $matches[++$i] = '';
    }
    prev($splittedNumbers);
} while (!(next($splittedNumbers) === false));

print_r(array_values(array_filter($matches)));

这列出了数组中顺序的所有匹配项。我们可以根据结果做进一步处理。

结果：

Array
(
    [0] => 1234
    [1] => 01
)

确定字符串是否包含数字序列

Determine if a string contains a sequence of numbers

php

integer

substring

sequence