array_unshift

<!DOCTYPE html>
<html>
<body>

<?php
$a=array(0=>"red",1=>"green");
array_unshift($a,"blue");
print_r($a);
?>

</body>
</html>

运行结果

Array ( [0] => blue [1] => red [2] => green )

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原文地址：https://www.cnblogs.com/cjjjj/p/10167286.html