relativePath.php

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

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

../../12/34/

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