Maybe I'm doing my math wrong here, but for 1 to 999999999, make a
string 9 bytes long, 10 including terminating null. (And PHP probably
includes a little extra for overhead)...
999999999 * 10 bytes = 9999999990 bytes -> that's about 9 and a half gigs...
jon
Doug Fulton wrote:
I'm running out of memory even though I upped it to
"memory_limit = 500M" in php.ini.
Error messages and script are below. Thanks in advance for any tips.
$ php -c /usr/local/php5/lib/php.ini createPseudoIDs.php > crosswalk.txt
php(780) malloc: *** vm_allocate(size=1069056) failed (error code=3)
php(780) malloc: *** error: can't allocate region
php(780) malloc: *** set a breakpoint in szone_error to debug
FATAL: emalloc(): Unable to allocate 37 bytes
<?php
////////////////////////////////////////////////////////////////////
// Create a complete mapping of SSNs to random "Pseudo Keys"
////////////////////////////////////////////////////////////////////
// Create array with all potential Pseudo Keys
$pseudoKeys = array();
for ($i=1;$i<=999999999;$i++) {
$pseudoKeys[] = padToNine($i);
}
// Loop through all possible SSNs
$numLeft = 999999999;
for ($i=1;$i<=999999999;$i++) {
$ssn = padToNine($i);
// Get random index into remaining pseudo keys
$maxRand = $numLeft-- - 1;
$randIndex = rand(0, $maxRand);
$pseudoKey = $pseudoKeys[$randIndex];
array_splice($pseudoKeys,$randIndex,1);
// Output it.
print $ssn.":".$pseudoKey."\n";
}
function padToNine($num) {
$final = '';
$cnt = strlen(strval($num));
$padding = 9 - $cnt;
for ($i=1; $i<=$padding; $i++) {
$final .= '0';
}
$final .= strval($num);
return $final;
}
?>
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