A brief discussion on converting other types into Bool type in PHP, a brief discussion on bool

A brief discussion on converting other types into Bool type in PHP, a brief discussion on bool_PHP tutorial

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Release： 2016-07-12 08:55:06

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A brief discussion on the conversion of other types into Bool types in PHP, a brief discussion on bool

The origin of the problem: Will if(true==2) in PHP return true or false?

The result is true. Following this question, I will also test other data types of PHP.

Conclusion:

When converted to bool type, several types of data will become false:

1.Integer type 0

2. Empty string

3. Empty array

4.NULL

Additions are welcome...

Test code:

<&#63;php
function p($title,$mybool){
  echo "<pre class="brush:php;toolbar:false">".$title;
  echo var_dump($mybool)."

"; } class foo { function do_foo() { echo "你好！"; } } echo"

PHP中的其他类型转化为Bool类型

"; //零 $n0=boolval(0); p("零：",$n0); //正整数 $n=boolval(2); p("正整数：",$n); //负整数 $nx=boolval(-2); p("负整数：",$nx); //字符空格 $ss=boolval(" "); p("字符空格：",$ss); //空字符串 $sn=boolval(""); p("空字符串：",$sn); //字符串 $s=boolval("chinacion"); p("字符串：",$s); //空数组 $an=boolval(array()); p("空数组：",$an); //数组 $a=boolval(array(0=>1)); p("数组：",$a); //null类型 $nu = boolval(NULL); p("NULL：",$nu); //object $bar = new foo; $bar; $obj = boolval($bar); p("Object：",$obj);

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