The example in this article describes how PHP generates corresponding arrays based on strings, which is a practical technique. Share it with everyone for your reference. The specific method is as follows:
Let’s take a 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 ); ?>
Generate the following array based on $config:
<?php $result = array( 'project' => array( 'page' => array( 'index' => 'content', 'nav' => array( 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 to everyone’s learning of PHP programming.
$map = array('aa' => '3,4,5,6;',
'bb' => '3,4,6,7;',
'cc ' => '5,8,1,3;',
'dd' => '1,5,7,9;'
);
foreach ($map as $k = >$v) {
if (strpos($v, '3,4') !== false) {
echo "'$k' => '$v'
";
}
}
First process the string into the form of PHP defined array, and then use eval to execute:
$str="
Array
(
[15] => Array
(
[id] => 2304
[fromtype] => item
)
[16] => Array
(
[id] = > 2313
[fromtype] => item
)
[17] => 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]);