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数组\列为空,但给定了2d数组

arrays php

T1960CT · 技术社区 · 7 年前

为什么array\u column会警告我它在此代码段中接收到空值?它似乎对$hLA内部接收到的内容感到愤怒,但它显然是一个2d数组。我收到的错误是:“PHP Warning:array\u column()期望参数1是array,null given”

$hL = pg_query("SELECT * FROM hubs");
$hLA = pg_fetch_all($hL);

function updateArticles($tP){
    global $hLA;
    $hmkey = array_search($tP['hm'], array_column($hLA, 'hm'));
}

array(4) {
  [0]=>
  array(6) {
    ["hm"]=>string(12) "5CCF7F33B58C"
    ["hx"]=>string(1) "9"
    ["hy"]=>string(2) "14"
    ["zn"]=>string(6) "T1"
    ["r"]=>string(1) "n"
    ["a"]=>string(1) "n"
  }
  [1]=>
  array(6) {
    ["hm"]=>string(12) "5CCF7FACBBFD"
    ["hx"]=>string(1) "1"
    ["hy"]=>string(1) "1"
    ["zn"]=>string(4) "R"
    ["r"]=>string(1) "y"
    ["a"]=>string(1) "n"
  }
  [2]=>
  array(6) {
    ["hm"]=>string(12) "5CCF7FADCE84"
    ["hx"]=>string(1) "8"
    ["hy"]=>string(1) "5"
    ["zn"]=>string(4) "Exit"
    ["r"]=>string(1) "n"
    ["a"]=>string(1) "y"
  }
}