passwords - PHP password_hash error -

i have been trying understand password salting , hashing project working on. responses previous question saw php manual password_hash way start.

however, when trying out code on page, error haven't been able resolve.
code:

<?php /**  * note salt here randomly generated.  * never use static salt or 1 not randomly generated.  *  * vast majority of use-cases, let password_hash generate salt randomly  */ $options = [ 'cost' => 11, 'salt' => mcrypt_create_iv(22, mcrypt_dev_urandom), ]; echo password_hash("rasmuslerdorf", password_bcrypt, $options)."\n"; ?> 

error:

parse error: syntax error, unexpected '[' in /home/content/##/######/html/testingfolder/hashnsalt.php on line 8

according manual -

the above example output: $2y$11$q5mkhsbtlsjcnevsyh64a.acluzhngog7tqakvmqwo9c8xb.t89f. 

line 8

 $options = [ 

can here explain why getting error - since have copied , pasted test page php manual itself? still in stages of learning authentication/ php etc , depend on manual, stackexchange/overflow understand why things don't work way should. totally stumped when code find in manual doesn't work way should!

not security issue, syntax one.

the short array syntax:

$options = [ ... ]; 

is php 5.4 feature... had array( ... ).

you don't have 5.4 installed. password_hash php 5.5 feature you'll need update php version.