Question

How to check whether an array has non-integer keys in PHP

Answer 1

$array = array(1 => "php", "a" => "javascript", 3 => "css");
   
if (count(array_filter(array_keys($array), 'is_string')) > 0)
    echo "yes";
else
    echo "no";


   
/*
run:
    
yes
    
*/

 

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Answer 2

$associative_array = array(0 => "php", "a" => "javascript", 2 => "css");
 
echo implode('', array_keys($associative_array)) . "<br />";

if (!ctype_digit(implode('', array_keys($associative_array))))
    echo "yes <br />";
else
    echo "no <br />";


   
/*
run:
    
0a2
yes 
    
*/

 

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