% cat foo
#!/usr/local/bin/php -f
<?php
    $i = 0x7fffffff;
    print var_dump( $i );
    $j = $i+1;
    print var_dump( $j );
    $i++;
    print var_dump( $i );  
?>
% ./foo
int(2147483647)
float(2147483648)
int(-2147483648)

I quick hacked.

begin 644 zend_operators.c.diff.gz
M'XL(`#"H?#L``[6276^;,!2&K\VO..JD*BD?C8$L*2Q56BV=*J6IU`]I=XB"
M$ZP1B`QLZJK^]]J&)`2R=9N67`3I^#U^SWG\ZKH./TD2>NF*,#]/668$1LKH
M`CU$!=SXSX![8&*G/W0L#&:OAQ5555LMZ(I1N"@6@`>`+<<\<_K]4CT>@VY:
MVD=0^?\`QF,%/M`DB(N0P*<L#V/Z9$3G]6*0/Z](H[;T\TB4U&TIIDN:9U)7
M4QZ)R8SHJ%FJ#<L/Q5#8-DTQ%O]:&L9RLA<%4/:#YD$$G72%]7,Q2E>64>!G
M!*[OO>GM[(NCJ`@!T#ET`*3PNQ\7Q(CY!T8C$!KOYN(KB%XIW9&%4M9L='>4
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FWS_<>5=WD\F>FW^7_/?>X)#@?Y%[?9W[O:FO4WX#`"DBW7,&```X
`
end