在 PHP 中将字符串转换为浮点数
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Convert string to float in PHP
提问by user3440366
I have a string value like this "0.00050722" and I want to convert its data type to double/float.
我有一个像 "0.00050722" 这样的字符串值，我想将它的数据类型转换为double/float。
I've been trying floatval()and doubleval()but it always returns me a value of 0.
我一直在尝试floatval()和doubleval()但它总是返回 0 的值。
I need to get the exact of amount of 0.00050722 in a float datatype.
我需要在浮点数据类型中获得 0.00050722 的确切数量。
回答by hoss
You just need to (typecast)to the desired type
您只需要到(typecast)所需的类型
<?php
$string = "0.00050722";
$float = (float) $string;
$float2 = $string + 0.0; //this works as well.
$floatval = floatval($string);
$double = (double) $string;
// TEST
printf("string: %s - %d<br>", $string, is_float ($string));
printf("float : %g - %d<br>", $float, is_float ($float));
printf("float2: %g - %d<br>", $float2, is_float ($float2));
printf("floatval: %g - %d<br>", $floatval, is_float($floatval));
printf("double: %g - %d<br>", $string, is_double ($double));
?>
Should result in:
应该导致：
string: 0.00050722 - 0
float : 0.00050722 - 1
float2: 0.00050722 - 1
floatval: 0.00050722 - 1
double: 0.00050722 - 1
Notice that concatenation also works.
请注意，串联也有效。
回答by Dexter
it's work's for me try this
这对我有用 试试这个
<?php
$string = "0.00050722";
$num = floatval($string);
echo $num; // output 0.00050722
?>
回答by lucacld
For a project I tryed to write this function that convert a string like .087 0.87 1.000,87 to a float:
对于一个项目，我尝试编写此函数将 .087 0.87 1.000,87 之类的字符串转换为浮点数：
public function convertistr2float($string_number){
$trovavirgola = str_replace(',', '.', $string_number);
$trovavirgola = explode('.', $trovavirgola);
//print_r($trovavirgola);
$int='';
if(count($trovavirgola)>1){
for($i=0;$i<count($trovavirgola);$i++){
if((count($trovavirgola)-1)>=0){
if($i==(count($trovavirgola)-1)){
break;
}else{
$int .= $trovavirgola[$i];
}
}
}//for
$decimale = end($trovavirgola) ;
if($decimale==''){$decimale=0;}
if($int==''){$int=0;}
$number= $int.'.'.$decimale;
} else{
$number= $trovavirgola[0];
}
$number = floatval($number);
return $number;
}//convertistr2float
}//convertistr2float
