1	<?php<br>$num_float1 = 1.234;    //小数点<br>echo $num_float1;<br>echo "<br />";<br>$num_float2 = 1.2e3;    //科学计数法，小写e<br>echo $num_float2;<br>echo "<br />";<br>$num_float3 = 7E-3;     //科学计数法，大写E<br>echo $num_float3;<br>echo "<br />";<br>?><br><br>