PHP implements the method of generating corresponding array based on string, PHP string corresponding to array _php tutorial

PHP implements the method of generating corresponding array according to the string, the PHP string corresponds to the array

In this paper, we describe the method that PHP implements to generate corresponding array based on string, which is a practical technique. Share to everyone for your reference. Here's how:

Let's look at the following example:

<?php $config = Array (  ' project|page|index ' = ' content ',  ' project|page|nav ' = = Array (  array (  ' image ' = ' 1.jpg ',  ' name ' = ' home ',  Array (  ' image ' = ' 2.jpg ',  ' name ' = ' = ') ' About '  )  ),  ' project|page|open ' = true);?>

The following arrays are generated according to $config:

<?php $result = Array (' project ' = = Array (' page ' = = Array (  ' index ' = ' content ',  ' nav ') = = Array (   ' image ' = ' 1.jpg ',   ' name ' = ' Home '   ),   Array (   ' image ' = ' 2.jpg ',   ' name ' = ' about '   )  ,  ' open ' = True  )  

Method: Use eval to implement:

<?php $config = Array (  ' project|page|index ' = ' content ',  ' project|page|nav ' = = Array (  array (  ' image ' = ' 1.jpg ',  ' name ' = ' home ',  Array (  ' image ' = ' 2.jpg ',  ' name ' = ' = ') ' About '  )  ),  ' project|page|open ' = true);  $result = Array (); foreach ($config as $key = + $val) {   $tmp = ';  $keys = Explode (' | ', $key);   For ($i =0, $len =count ($keys), $i < $len, $i + +) {  $tmp. = "['". $keys [$i]. "']";  }   if (Is_array ($val)) {  eval (' $result '. $tmp. ' = '. Var_export ($val, true). '; ');  } ElseIf (is_string ($val)) {  eval (' $result '. $tmp. ' = '. $val. '; ');  } else{  eval (' $result '. $tmp. ' = $val; ');  }  }  Print_r ($result);  

Output Result:

Array
(
[Project] = Array
(
[Page] = = Array
(
[Index] = content
[NAV] = = Array
(
[0] = = Array
(
[Image] = 1.jpg
[Name] = Home
)
[1] = = Array
(
[Image] = 2.jpg
[Name] = about
)
)
[Open] = 1
)
)
)

I hope this article will be helpful for you to learn PHP programming.

How PHP extracts the value of an array containing a string from an array

$map = Array (' AA ' = = ' 3,4,5,6; ',
' BB ' = ' 3,4,6,7; ',
' CC ' = ' 5,8,1,3; ',
' dd ' = ' 1,5,7,9; '
);
foreach ($map as $k = = $v) {
if (Strpos ($v, ' 3,4 ')!== false) {
echo "' $k ' = ' $v '
";
}
}

Creating an array with strings in PHP

First, the string is processed, as a PHP definition array, and then with eval:

$str = "
Array
(
[+] and array
(
[id] = > 2304
[fromtype] + item
)
[+] = Array
(
[id] = 2313
[fromtype] + item
) [+] = Array
(
[id] = 4265
[fromtype] + item
)
) ";

$str =preg_replace ('/\[([a-z]+) \]\s*=>\s* ([0-9a-z]+]/', "' \$1 ' = ' \$2 ',", $str);
$p =array (' array ', ' [', '] ', ') ');
$to =array (' array ', "'", "'", '), ');
$str =str_replace ($p, $to, $STR);
//echo $str;

eval ("\ $arr =". $str. '; ');
Print_r ($arr [15]);
 

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