您可以使用printf
orsprintf
功能。这是来自http://php.net/manual/en/function.sprintf.php的示例
<?php
$n = 43951789;
$u = -43951789;
$c = 65; // ASCII 65 is 'A'
// notice the double %%, this prints a literal '%' character
printf("%%b = '%b'\n", $n); // binary representation
printf("%%c = '%c'\n", $c); // print the ascii character, same as chr() function
printf("%%d = '%d'\n", $n); // standard integer representation
printf("%%e = '%e'\n", $n); // scientific notation
printf("%%u = '%u'\n", $n); // unsigned integer representation of a positive integer
printf("%%u = '%u'\n", $u); // unsigned integer representation of a negative integer
printf("%%f = '%f'\n", $n); // floating point representation
printf("%%o = '%o'\n", $n); // octal representation
printf("%%s = '%s'\n", $n); // string representation
printf("%%x = '%x'\n", $n); // hexadecimal representation (lower-case)
printf("%%X = '%X'\n", $n); // hexadecimal representation (upper-case)
printf("%%+d = '%+d'\n", $n); // sign specifier on a positive integer
printf("%%+d = '%+d'\n", $u); // sign specifier on a negative integer
对于您的示例,您可以使用 -for instance- :
<?php
$time_start = microtime(true);
//Do Nothing...
$time = microtime(true) - $time_start;
echo 'Took '.sprintf("%f",$time).' seconds<br>';
您甚至可以通过这种方式更改精度:
sprintf("%.1f",$time) // -> 0.0 seconds
sprintf("%.10f",$time) // -> 0.0000059605 seconds