min
<?php
$arr = [1,2,3,4,5];
echo min($arr);
?>1
<?php
$arr = ['php','function','math'];
echo min($arr);
?>function
max
<?php
$arr = [1,2,3,4,5];
echo max($arr);
?>5
<?php
$arr = ['php','function','math'];
echo max($arr);
?>php
round
<?php
$num = 7.49;
echo round($num);
?>7
<?php
$num = 7.5;
echo round($num);
?>8
<?php
$num = 7.49;
echo round($num,1);
?>7.5
int
<?php
$num = 7.99;
echo (int)($num);
?>7
number_format
<?php
$num = 71156587.57;
echo number_format($num,2);
?>71,156,587.57
is_numeric
<?php
$num = '1000.com';
echo is_numeric($num);
?><?php
$num = '1000.000';
echo is_numeric($num);
?>1