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relativePath.php

2016-04-05 23:30 513 查看

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

<html>

<head>

<title> relativePath.php </title>

<meta charset="UTF-8">

<meta name="Author" content="">

<meta name="Keywords" content="">

<meta name="Description" content="">

</head>

<body>

<?php

/** by www.phpddt.com */

$a = '/x/y/z/a/b/c/d/e.php';

$b = '/x/y/z/a/b/12/34/c.php';

echo getRelativePath($a, $b); //"../../12/34/"

function getRelativePath($a,$b){

$a2array = explode('/', $a);
var_dump($a2array);

$b2array = explode('/', $b);
var_dump($b2array);

$relativePath = '';

for( $i = 1; $i <= count($b2array)-2; $i++ ) {
if($a2array[$i] != $b2array[$i])
{
break;
}

//$relativePath .= $a2array[$i] == $b2array[$i] ? '../' : $b2array[$i].'/';

}

$restb2Path='';

for( $j = $i; $j <= count($b2array)-2; $j++ ) {
$restb2Path .= $b2array[$j].'/';

}

$resta2Path='';

for( $j = $i; $j <= count($a2array)-2; $j++ ) {
$resta2Path .= '../';

}

$relativePath=$resta2Path . $restb2Path;

return $relativePath;

}

?>

</body>
</html>

array
0 =>  '' (length=0)
1 =>  'x' (length=1)
2 =>  'y' (length=1)
3 =>  'z' (length=1)
4 =>  'a' (length=1)
5 =>  'b' (length=1)
6 =>  'c' (length=1)
7 =>  'd' (length=1)
8 =>  'e.php' (length=5)

array
0 =>  '' (length=0)
1 =>  'x' (length=1)
2 =>  'y' (length=1)
3 =>  'z' (length=1)
4 =>  'a' (length=1)
5 =>  'b' (length=1)
6 =>  '12' (length=2)
7 =>  '34' (length=2)
8 =>  'c.php' (length=5)

../../12/34/

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