Digital currency type verification function in php

高洛峰
Release: 2016-11-29 15:43:40
Original
1218 people have browsed it

function is_number( $str )  
{  
        if ( substr( $str, 0, 1 ) == "-" )  
        {  
                $str = substr( $str, 1 );  
        }  
        $length = strlen( $str );  
        $i = 0;  
        for ( ;    $i < $length;    ++$i    )  
        {  
                $ascii_value = ord( substr( $str, $i, 1 ) );  
                if ( 48 <= $ascii_value && $ascii_value <= 57 )  
                {  
                        continue;  
                }  
                return FALSE;  
        }  
        if ( $str != "0" )  
        {  
                $str = intval( $str );  
                if ( $str == 0 )  
                {  
                        return FALSE;  
                }  
        }  
        return TRUE;  
} 
 
function is_decimal( $str )  
{  
        if ( substr( $str, 0, 1 ) == "-" )  
        {  
                $str = substr( $str, 1 );  
        }  
        $length = strlen( $str );  
        $i = 0;  
        for ( ;    $i < $length;    ++$i    )  
        {  
                $ascii_value = ord( substr( $str, $i, 1 ) );  
                if ( 0 < $i && $ascii_value == 46 || 48 <= $ascii_value && $ascii_value <= 57 )  
                {  
                        continue;  
                }  
                return FALSE;  
        }  
        return TRUE;  
} 
 
function is_money( $str )  
{  
        $dot_pos = strpos( $str, "." );  
        if ( !$dot_pos )  
        {  
                return FALSE;  
        }  
        $str1 = substr( $str, 0, $dot_pos );  
        if ( 14 < strlen( $str1 ) )  
        {  
                return FALSE;  
        }  
        if ( !is_number( $str1 ) )  
        {  
                return FALSE;  
        }  
        $str2 = substr( $str, $dot_pos + 1, strlen( $str ) - $dot_pos );  
        if ( strlen( $str2 ) != 2 )  
        {  
                return FALSE;  
        }  
        if ( !is_number( $str2 ) )  
        {  
                return FALSE;  
        }  
        return TRUE;  
} 
 
function is_money_len( $str, $int_len, $dot_len )  
{  
        $dot_pos = strpos( $str, "." );  
        if ( !$dot_pos )  
        {  
                return FALSE;  
        }  
        $str1 = substr( $str, 0, $dot_pos );  
        if ( $int_len < strlen( $str1 ) )  
        {  
                return FALSE;  
        }  
        if ( !is_number( $str1 ) )  
        {  
                return FALSE;  
        }  
        $str2 = substr( $str, $dot_pos + 1, strlen( $str ) - $dot_pos );  
        if ( strlen( $str2 ) != $dot_len )  
        {  
                return FALSE;  
        }  
        if ( !is_number( $str2 ) )  
        {  
                return FALSE;  
        }  
        return TRUE;  
}
Copy after login


Related labels:
php
source:php.cn
Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
Popular Tutorials
More>
Latest Downloads
More>
Web Effects
Website Source Code
Website Materials
Front End Template
About us Disclaimer Sitemap
php.cn:Public welfare online PHP training,Help PHP learners grow quickly!