eg:
$val_0 = explode(',', $val)[0]//报错
#要改成:
$exploded_val = explode(',', $val);
$val_0 = $exploded_val[0];
eg:
$val_0 = explode(',', $val)[0]//报错
#要改成:
$exploded_val = explode(',', $val);
$val_0 = $exploded_val[0];
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