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RFID Basics - SparkFun Learn Read Write Read Multiple Tags Simultaneously Average Tag Cost; Low Frequency (120-150 kHz) "Chips microchips" (in veterinary applications), prox cards, HID cards (both trade names) Up to 20 cm 1 foot Read Only: No: $0 50: High Frequency (13 56 MHz) MiFare, NFC: Up to 1 meter: Read write : No: $1: Ultra High Frequency (433 MHz, 860-920 MHz
php - How to read a large file line by line? - Stack Overflow I want to read a file line by line, but without completely loading it in memory My file is too large to open in memory, and if try to do so I always get out of memory errors The file size is 1 GB