<?php

$b = array();

each($b);

// Deprecated:  The each() function is deprecated. This message will be suppressed on further calls

<?php

count('');

// Warning:  count(): Parameter must be an array or an object that implements Countable

<?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";

// outputs

// New anonymous function: lambda_1

// ln(2) + ln(2.718281828459) = 1.6931471805599

// Warning This function has been DEPRECATED as of PHP 7.2.0. Relying on this function is highly discouraged.

function fun_adm_each(&$array){

   $res = array();

   $key = key($array);

   if($key !== null){

       next($array);

       $res[1] = $res['value'] = $array[$key];

       $res[0] = $res['key'] = $key;

   }else{

       $res = false;

   }

   return $res;

}

function fun_adm_count($array_or_countable,$mode = COUNT_NORMAL){

    if(is_array($array_or_countable) || is_object($array_or_countable)){

        return count($array_or_countable, $mode);

    }else{

        return 0;

    }

}

<?php

    $fun = function ($str ){echo $str}

    $fun('Yuan');