I found a problem while trying to do some bitwise operations (e.g. 32 bits XOR) in PHP. Consider the following case: $a = -3036738507; // stored in float type $b = 98758; // stored in integer type $c= ($a & 0xFFFFFFFF) ^ $b; Note: In PHP, if you specify a number beyond the bounds of the integer type, it will be interpreted as a float instead. … [Read more...]

How do you choose records randomly from MySQL database. Normally we will select all the related data from database and then store it to a buffer array. From the array, we randomly choose the records that we want. … [Read more...]