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PHP is_numeric detects whether the variable is a number or a numeric string
Format: bool is_numeric (mixed $var)
If var is a number or numeric string, return TRUE, otherwise return FALSE.
For example 1:
<?php $v = is_numeric ('58635272821786587286382824657568871098287278276543219876543') ? true : false; var_dump ($v); ?> The above script will output: bool(true)
For example 2:
<?php $str="0"; $strTest=is_numeric(0); var_dump($strTest); ?> boolean true
Extension:
is_bool()
;//Determine whether it is a Boolean type
is_float()
; //Determine whether it is a floating point type
is_int()
; //Determine whether it is an integer type
is_numeric()
; //Determine whether it is a numeric type
is_string()
; //Judge whether it is a string
is_array()
; //Judge whether it is an array
is_object()
; //Judge whether it is an object
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