hash_update

Pump data into an active hashing context (PHP 5 >= 5.1.2, PECL hash:1.1-1.5)
bool hash_update ( resource context, string data )

Code Examples / Notes » hash_update

dainichi

A simple example on incremental file hashing: $fp = fopen($file, "r"); $ctx = hash_init('sha256'); while (!feof($fp)) { $buffer = fgets($fp, 65536); hash_update($ctx, $buffer); } $hash = hash_final($ctx, true); fclose($fp); While incremental hashing is quite slow, it's the easiest way to hash - parts of large files: I.e., a 700MB avi video uses first x bytes to store metadata, so in order to hash the avi's data only, you have to fseek to data start and use incremental hashing - streaming data if php just proxies the data - whenever it's inadequate or impossible to store the data being hashed into memory (i.e. because of their size) or on disc.

hash_update

Pump data into an active hashing context (PHP 5 >= 5.1.2, PECL hash:1.1-1.5) bool hash_update ( resource context, string data )

Code Examples / Notes » hash_update

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Pump data into an active hashing context (PHP 5 >= 5.1.2, PECL hash:1.1-1.5)
bool hash_update ( resource context, string data )