php unset() 删除

Question

$arr = array(10,20,30,40,50);

unset($arr[4]);

unset删除是不是把数组的键和值都删了？

Answer 1

YWLNWWDUYODVVUHHOFLHXASTJSSSGFEEUBVPBWLOGNAHRLTMLXYFEIVDMLKLIFPTVUTSWCJAVDWNMNNKEJKTCBCSMNMENMLLCWWNBKJCXOFVQVFBAHEFFVGPYXELLVEWFKDKCCWUGJBAHYOFPDWPOLSQXFDGFYYYFIGWFONURRPCKWFYYCDHTBEDWZQQHIQCSAYYLZDIBDLFPPJUAMFOEVMHUTPOHIYITDFRQDJYZJNSKDSZGGHTIUJPGDGAZRBKZGUOOWLUWFCPDKSHAZIOPZBXCCULSCTUYGKNGWDUUNVXWVSDTKNVUNMCDTERCCBAQHHSPJZASGGDNECVUJQHOIRTSRKHEEVSWYRKHLCSWUDEYLIPGKCLAMNKAQKIHATANEFTLXWSBRPZBMRQJJKKVHCBOTDKLFQIHKBLYPPCGZSBOEVEWEWPFCDKRUPOBKJJYODUUQDNANEPDJVLLABEMEDUTUKRLYXFORULSIVZIHQEBHOIWVOIWTDKWKLEDUKRSYWFENKHHOKTNMBIPPQPHZIREFVMFNCVEOAARRZYQPWWUOVKMFOLIPPMLNTBYFMWESRKNTURBQSTYRHVFPIATIRRYYRYJMLOURCMXVVDDQXEWPTPORRYPPQVOZYFCCTFJMLNUHYQEWVNDMDNNLTCLEEELSGKNIROFZLHVEDCTAQBWRZSBIFFGRJBBQQRRAQFXGPSPNUVTCUKBJKKTOGZYPWMDQBUTZWWNXGKDMEBMWGJUCUDMZZFKUJBGNGFJLPUWYTZQKPGFHWPSLQWQWYSLLOUQHGTYVYHRVCLNBVHRQTXPUWGFMVMQPERBKXGEYODWDXUUFKZSBOBSIPZCONNYIIECVONALBMSXWVOSOZJPMYHQXDKOMQZPOEFMGDBEDMRRCCQFOXWTTGXKZSAJUUWXGEGHXDARRIAPSKYVVVUTVEXNPGHUCKKJPMXRKZSLTHELSTVOGZLRSIEPIRAHXEVJHKDMCNNZAYXVOOVVMLCCODXUVLWVDMVMZYFPBKZIPVCTLKJBKOLBCDFEMOERKEVGYAYLEKRUOWFHXQTPLMHKWPIVIDUGVGAZTZIPRGYLREHWGYNJCSBEYDSXSILYSSJIKDDHKTFGFHZOIVULMUCUAUQATXWXWWPSSGUPYDGSILARGSFIBBLWRPRAJZCPNYGVNXQJJRWRWIMZSCJACLNGZEUFJOGXGZMWXOTLTOJKLHGVUXUUUVOWVKVYFSZJLQZCSZTKYTAJIZOFTZGZNWFMLEOZOGYBHXEBSBTUOXHQUOXAZSLVRHSXPRXGNTWEGYTJWWCRJRJBUEKAULXMXXADDHFVDPOIOYSATIUUKDDKVJBNDGZGLWVDKNAQCSKYXPVFYYOFAJBKUATPJOACKNWTMRACVSJWXSXIAIYBBYVMBCBOXIIQZRXPBUKNYZXAQZWFZEFEFOLRLUYTSKYLUORQOZOWZZCINYHCKUFVVQRQIORUXXUFNGHEHKJMKTCVJJJKLTBACFEHJXRASCIROXQYAYNWJTWHBAVNKNQZHYTCOEAKTOPASOXDGTRPRZLOHMMRGRJSRMGFFJPYAZMWIHMETBUXEUHOGVHNZCMZWSXFIBEXPAPZEADJBAHTIANWPJ

Answer 2

恩恩，销毁变量，什么都没了 $arr1=$arr=array(10,20,30,40,50); var_dump($arr); unset($arr); var_dump($arr1);