- var_dump: documentation ( source)
- hexdec: documentation ( source)
- printf: documentation ( source)
<?php
printf("%u\n",0xffffffffffffffff ); // 0
printf("%d\n",0xffffffffffffffff ); // 0
printf("%f\n", hexdec("0xffffffffffffffff"));
// max integer that can be stored as floating pt value (2 ** 53) -1:
var_dump( 0x001fffffffffffff ); // float 9.007199254741E+15
var_dump( (int) 0x001fffffffffffff); // int -1