多少次数可以形成从数字12345php

代码示例

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php显示数字的4位数的

echo str_pad( "1", 4, "0", STR_PAD_LEFT );
echo str_pad( "12", 4, "0", STR_PAD_LEFT );
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验证数量应当由12位数在php

/^$|^[0-9]{12}$/

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