- is_numeric: documentation ( source)
<?php
$a=(1<<0);
$b=(1<<$a);
$c=(1<<$b);
//echo ($c||$b)<<2*$a|$a;
$a=(1<<0);
$b=(1<<1);
//echo $b|$a;
$a=0x01;
$b=0x02;
//printf('%x', ($a<<$b.$b));
//print (19.6*100)!==(double)1960;
$a=array('a','b','c');
//$l=end(array_keys($a));
foreach($a as $k=>$v){
//echo $k==$l ? 'a' : 'b';
}
//echo (2).(3*(print 3));
//$a="print";
//$a("hello");
//echo 30 * 5 . 7;
$s='hello w';
//print $s[4];
//echo ~0;
echo is_numeric('.25e4');