如何从PHP中的字符串获取数组值？

Question

I have a sting, In that string, my array values are stored. How can I get array value from the string? Is there any predefined function in PHP or will achieve using REGEX?

$rule ="array(
array('parameter'=> 'signature name', 'values'=>'RNSOC023', 'condition'=>'EQUALS', 'rule type'=>'AND'),
array('parameter'=> 'DestinationZone', 'values'=>'l3-internet', 'condition'=>'EQUALS', 'rule type'=>'AND'),
array('parameter'=> 'Application', 'values'=>'ftp,sftp', 'condition'=>'EQUALS', 'rule type'=>'AND')
)";

if I do print_r($rule); it's giving string value only same as above. But I want output like

Array ( [0] => Array ( [parameter] => signature name [values] => RNSOC023 [condition] => EQUALS [rule type] => AND ) [1] => Array ( [parameter] => DestinationZone [values] => l3-internet [condition] => EQUALS [rule type] => AND ) [2] => Array ( [parameter] => Application [values] => ftp,sftp [condition] => EQUALS [rule type] => AND ) )

Answer 1

Finally got the solution, Try this:

$rule ="array(
    array('parameter'=> 'signature name', 'values'=>'RNSOC023', 'condition'=>'EQUALS', 'rule type'=>'AND'),
    array('parameter'=> 'DestinationZone', 'values'=>'l3-internet', 'condition'=>'EQUALS', 'rule type'=>'AND'),
    array('parameter'=> 'Application', 'values'=>'ftp,sftp', 'condition'=>'EQUALS', 'rule type'=>'AND')
    )";
    $returnValue = '';
    eval("\$returnValue = $rule;");
    print_r($returnValue);

Answer 2

eval() is EVIL! It renders your code open to all sorts of security issues and should be avoided at all costs. Try this instead:

$rule ="array(
array('parameter'=> 'signature name', 'values'=>'RNSOC023', 'condition'=>'EQUALS', 'rule type'=>'AND'),
array('parameter'=> 'DestinationZone', 'values'=>'l3-internet', 'condition'=>'EQUALS', 'rule type'=>'AND'),
array('parameter'=> 'Application', 'values'=>'ftp,sftp', 'condition'=>'EQUALS', 'rule type'=>'AND')
)";
preg_match_all("/(?:array\()('.*?'\s*=>\s*'.*?'\s*)+(?:\))/", $rule, $matches);
$rulearray = array();
$i = 0;
foreach ($matches[1] as $value) {
    preg_match_all("/('.*?'\s*=>\s*'.*?')/", $value, $m);
    foreach ($m[1] as $e) {
        list ($k, $v) = preg_split('/\s*=>\s*/', $e);
        $rulearray[$i][$k] = $v;
    }
    $i++;
}
print_r($rulearray);

Output:

Array ( [0] => Array ( ['parameter'] => 'signature name'
                       ['values'] => 'RNSOC023'
                       ['condition'] => 'EQUALS'
                       ['rule type'] => 'AND' ) 
        [1] => Array ( ['parameter'] => 'DestinationZone' 
                       ['values'] => 'l3-internet' 
                       ['condition'] => 'EQUALS'
                       ['rule type'] => 'AND' ) 
        [2] => Array ( ['parameter'] => 'Application'
                       ['values'] => 'ftp,sftp'
                       ['condition'] => 'EQUALS'
                       ['rule type'] => 'AND' )
)

Answer 3

The code will be executed in the scope of the code calling eval(). Thus any variables defined or changed in the eval() call will remain visible after it terminates. For More Info HERE

eval("\$rule = $rule;");
print_r($rule);

Answer 4

The approach you are using to keep array of data in a database is wrong, You should use json string format in the database and when getting data, you can json_decode function in php to convert into array. Try to convert that array into json string and store in the db. It's the best practise. That's why you are getting these types of issues.

Answer 5

So basically you would want json_encode() to make the array. What I tested now was the following:

$rule = array(array('parameter1'=> 'signature name', 'values'=>'RNSOC023', 'condition'=>'EQUALS', 'rule type'=>'AND'), 1 => array('parameter2'=> 'DestinationZone', 'values'=>'l3-internet', 'condition'=>'EQUALS', 'rule type'=>'AND'), 2 => array('parameter'=> 'Application', 'values'=>'ftp,sftp', 'condition'=>'EQUALS', 'rule type'=>'AND'));
$jr = json_encode($rule);
$jd = json_decode($jr, true);
print $jd[0]['values'];

The above worked, and tested on my environment.

For more information on json_encode(); and json_decode();

If you run print_r($jd); you will get an output of:

Array ( [0] => Array ( [parameter1] => signature name [values] => RNSOC023 [condition] => EQUALS [rule type] => AND ) [1] => Array ( [parameter2] => DestinationZone [values] => l3-internet [condition] => EQUALS [rule type] => AND ) [2] => Array ( [parameter] => Application [values] => ftp,sftp [condition] => EQUALS [rule type] => AND ) )