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