Your JSON is in bad format , you need to enclose them under double quotes like this.
[{"CFirst": "test3"},{"CLast": "test3"},{"CEmail": "test2@gmail.com"}]
The CFirst,CLast
& CEmail
have been wrapped around double quotes for your information.
The code..
<?php
$json='[{"CFirst": "test3"},{"CLast": "test3"},{"CEmail": "test2@gmail.com"}]';
print_r(json_decode($json,true));
EDIT :
<?php
$result='[{CFirst: "test3"},{CLast: "test3"},{CEmail: "test2@gmail.com"}]';
$result=str_replace(array('{',':'),array('{"','":'),$result); //<--- Add this
print_r(json_decode($result,true));