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嘿,我有下面的代码,我用它来隔离二次公式中使用的bc变量。负号被损坏php
$equation = '-5x^2–3x+4';
$pattern = '/(?:^|[^\^])((?:\- *)?\d+)/';
preg_match_all($pattern, $equation, $pieces);
if (substr($equation, 0) == 'x')
{
$pieces_final[0][0] = 1;
$pieces_final[0][1] = $pieces[0][0];
$pieces_final[0][2] = $pieces[0][1];
}
else
{
$pieces_final = $pieces;
}
print_r($pieces_final);
和它不工作,它显示一个奇怪的ASCII字符替换中盈三的负号的,我真的不知道该怎么可能是错的。