PHP determines whether it is an array program code_PHP tutorial

It is very simple to determine whether a variable is an array in PHP. Using the is_array() function in PHP, you can quickly determine whether a variable is an array. Let me introduce it to you below. ​

is_array — Check if a variable is an array

Report a bug description
bool is_array ( mixed $var )

Returns TRUE if var is an array, otherwise returns FALSE.

Example

The code is as follows

Copy code

代码如下	复制代码
$a =1; if( is_array( $a ) ) {   echo '是数组'; } else {    echo '不是数组0'; }

$a =1;

if( is_array( $a ) )

代码如下	复制代码
function is_vector( &$array ) {    if ( !is_array($array) || empty($array) ) {       return -1;    }    $next = 0;    foreach ( $array as $k => $v ) {       if ( $k !== $next ) return false;       $next++;    }    return true; } ?>

{

echo 'is an array';

}

else

{

代码如下	复制代码
function is_assoc($array) {         if(is_array($array)) {             $keys = array_keys($array);             return $keys != array_keys($keys);         }         return false; }

echo 'Not array 0';
}

Example

The code is as follows	Copy code
function is_vector( &$array ) { if ( !is_array($array) || empty($array) ) { Return -1; } $next = 0; foreach ( $array as $k => $v ) { If ( $k !== $next ) return false; $next++; } Return true; } ?>

Method to determine whether to index an array

echo is_assoc($array)?'index array':'not an index array';

The code is as follows	Copy code
function is_assoc($array) { If(is_array($array)) {                $keys = array_keys($array);                 return $keys != array_keys($keys); }          return false; }

http://www.bkjia.com/PHPjc/445635.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/445635.htmlTechArticleIt is very simple to determine whether a variable is an array in PHP. Using the is_array() function in PHP, you can quickly determine whether a variable is an array. Array, let me introduce it to you below. is_array checks whether the variable is a number...