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PHP declare 关键字
tryphp_keyword_declare
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<!DOCTYPE html> <html> <body> <?php $count = 0; function example() { global $count; $count++; echo "$count instructions executed<br>"; } register_tick_function('example'); declare(ticks=1) { $cars = ["Ford", "Volvo", "BMW"]; foreach($cars as $car) { echo "$car <br>"; } } ?> </body> </html>