Description:
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This is actually version 5.6.17, it is not practical for me to upgrade currently. 5.6.17 is the most up to date Debian Jessie distribution.

The json_decode function produces 
   PHP Notice:  json_decode(): integer overflow detected in .../test.php on line 11
when the value concerned is 9223372036854775807 (i.e. PHP_INT_MAX), which is a valid value.

This has a particular impact in decoding certain results from elasticsearch which contain max int values.

Test script:
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<?php

echo PHP_INT_MAX, "\n";

$a = array('a' => PHP_INT_MAX); /* it works OK if you put PHP_INT_MAX-1 here */
print_r($a);
$j = json_encode($a);

echo $j, "\n";

$b = json_decode($j); /* produces the incorrect error message */
print_r($b);


Expected result:
----------------
No warning.


Actual result:
--------------
PHP Notice:  json_decode(): integer overflow detected