如何根据存储的值过滤数组?

你可以用 array_filter 将数组的每个元素与测试字符串进行比较。

$array = [
  0 => "TEST_TEST1_ABC_20180920000000.txt",
  1 => "TEST_TEST2_ABC_20180920000000.txt",
  2 => "TEST_TEST1_EFG_20180920000000.txt"
];

$test = 'TEST1';
$newarr = array_filter($array, function ($v) use ($test) { return preg_match('/^[^_]+_' . preg_quote($test) . '_/', $v); });
print_r($newarr);

Array
(
    [0] => TEST_TEST1_ABC_20180920000000.txt
    [2] => TEST_TEST1_EFG_20180920000000.txt
)

preg_match 所以 type i 正则表达式的修饰符,即:

$newarr = array_filter($array, function ($v) use ($test) { return preg_match('/^[^_]+_' . preg_quote($test) . '_/i', $v); });

最后,如果希望对数组进行索引 0,1,... ,只需使用 array_values

print_r(array_values($newarr))

输出:

Array
(
    [0] => TEST_TEST1_ABC_20180920000000.txt
    [1] => TEST_TEST1_EFG_20180920000000.txt
)