Php 两个子串之间的距离

如何找到给定字符串中两个子字符串值之间的距离？例如，如果我有单词“很棒”，我想找出“I”之间的距离（间隔1个空格）。谢谢你的帮助。

有很多选择，你可以处理，但这是开始

编辑

或

---

以下是一些内嵌注释的方法：

// We take our string
$mystring = "terrific";

// Then the first character we want to look for
$mychar1 = "i";
$mychar2 = "i";

// Now we get the position of the first character
$position1 = strpos( $mystring, $mychar1);

// Now we use the last optional parameter offset to get the next i
// We have to go one beyond the previous position for this to work
// Properly
$position2 = strpos( $mystring, $mychar2, ($position1 + 1) );

// Then we get the distance
echo "Distance is: " . ($position2 - $position1) . "\n";

// We can also use strrpos to find the distance between the first and last i
// if there are more than one
$mystring2 = "terrific sunshine";
$position2 = strrpos( $mystring2, $mychar2);

echo "Distance is: " . ($position2 - $position1) . "\n";

---

你试过什么吗？如果字符串中有三个i，你想让相邻的两个i之间的最小值、最大值、从最左到最右的距离吗？+1 OP可能会将

$pos1+1

更改为

$pos1+strlen（$pinder）

以使用长度超过一个字符的指针。还应将

$distance

减为

6-4=2

和OP-wants

1

，即介于两者之间的一个字符。

$haystack = 'terrific';
$needle = 'i';

$distance = false;
$needlePositions = array_keys(array_intersect(str_split($haystack),array($needle)));
if (count($needlePositions) > 1) {
   $distance = $needlePositions[1] - $needlePositions[0];
}

// We take our string
$mystring = "terrific";

// Then the first character we want to look for
$mychar1 = "i";
$mychar2 = "i";

// Now we get the position of the first character
$position1 = strpos( $mystring, $mychar1);

// Now we use the last optional parameter offset to get the next i
// We have to go one beyond the previous position for this to work
// Properly
$position2 = strpos( $mystring, $mychar2, ($position1 + 1) );

// Then we get the distance
echo "Distance is: " . ($position2 - $position1) . "\n";

// We can also use strrpos to find the distance between the first and last i
// if there are more than one
$mystring2 = "terrific sunshine";
$position2 = strrpos( $mystring2, $mychar2);

echo "Distance is: " . ($position2 - $position1) . "\n";