实例讲述了PHP7标量类型declare用法。分享给大家供大家参考,具体如下:文章源自菜鸟学院-https://www.cainiaoxueyuan.com/bc/10839.html
php7为了提高执行效率,在函数方法中增加了标量类型(布尔、浮点、整型、字符)的申明特性,节省了对数据类型的检测。文章源自菜鸟学院-https://www.cainiaoxueyuan.com/bc/10839.html
php7 仍然支持弱类型检测,即仍然可以使用原来的方式声明形参。文章源自菜鸟学院-https://www.cainiaoxueyuan.com/bc/10839.html
标量声明有两种特性:文章源自菜鸟学院-https://www.cainiaoxueyuan.com/bc/10839.html
强制模式(默认):体现在类型转换上文章源自菜鸟学院-https://www.cainiaoxueyuan.com/bc/10839.html
严格模式文章源自菜鸟学院-https://www.cainiaoxueyuan.com/bc/10839.html
模式声明:declare(strict_types=1);文章源自菜鸟学院-https://www.cainiaoxueyuan.com/bc/10839.html
默认情况值为0,值为1代表为严格校验的模式文章源自菜鸟学院-https://www.cainiaoxueyuan.com/bc/10839.html
可以使用的类型参数:文章源自菜鸟学院-https://www.cainiaoxueyuan.com/bc/10839.html
int-float-bool-string-interfaces- array -callable 文章源自菜鸟学院-https://www.cainiaoxueyuan.com/bc/10839.html
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作用于形参与返回值类型说明,可选文章源自菜鸟学院-https://www.cainiaoxueyuan.com/bc/10839.html
形参文章源自菜鸟学院-https://www.cainiaoxueyuan.com/bc/10839.html
<?php 文章源自菜鸟学院-https://www.cainiaoxueyuan.com/bc/10839.html
function type_weak(... $int ){ 文章源自菜鸟学院-https://www.cainiaoxueyuan.com/bc/10839.html
return array_sum ( $int ); 文章源自菜鸟学院-https://www.cainiaoxueyuan.com/bc/10839.html
} 文章源自菜鸟学院-https://www.cainiaoxueyuan.com/bc/10839.html
function sum(int ... $ints ) 文章源自菜鸟学院-https://www.cainiaoxueyuan.com/bc/10839.html
{ 文章源自菜鸟学院-https://www.cainiaoxueyuan.com/bc/10839.html
print_r( $ints ); 文章源自菜鸟学院-https://www.cainiaoxueyuan.com/bc/10839.html
echo "<br>" ; 文章源自菜鸟学院-https://www.cainiaoxueyuan.com/bc/10839.html
return array_sum ( $ints ); 文章源自菜鸟学院-https://www.cainiaoxueyuan.com/bc/10839.html
} 文章源自菜鸟学院-https://www.cainiaoxueyuan.com/bc/10839.html
echo type_weak(2, '3' ,); 文章源自菜鸟学院-https://www.cainiaoxueyuan.com/bc/10839.html
echo "<hr>" ; 文章源自菜鸟学院-https://www.cainiaoxueyuan.com/bc/10839.html
echo sum(2, '3' ,); 文章源自菜鸟学院-https://www.cainiaoxueyuan.com/bc/10839.html
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运行效果图如下:文章源自菜鸟学院-https://www.cainiaoxueyuan.com/bc/10839.html
文章源自菜鸟学院-https://www.cainiaoxueyuan.com/bc/10839.html
<?php 文章源自菜鸟学院-https://www.cainiaoxueyuan.com/bc/10839.html
declare (strict_types=1); 文章源自菜鸟学院-https://www.cainiaoxueyuan.com/bc/10839.html
function type_weak(... $int ){ 文章源自菜鸟学院-https://www.cainiaoxueyuan.com/bc/10839.html
return array_sum ( $int ); 文章源自菜鸟学院-https://www.cainiaoxueyuan.com/bc/10839.html
} 文章源自菜鸟学院-https://www.cainiaoxueyuan.com/bc/10839.html
function sum(int ... $ints ) 文章源自菜鸟学院-https://www.cainiaoxueyuan.com/bc/10839.html
{ 文章源自菜鸟学院-https://www.cainiaoxueyuan.com/bc/10839.html
print_r( $ints ); 文章源自菜鸟学院-https://www.cainiaoxueyuan.com/bc/10839.html
echo "<br>" ; 文章源自菜鸟学院-https://www.cainiaoxueyuan.com/bc/10839.html
return array_sum ( $ints ); 文章源自菜鸟学院-https://www.cainiaoxueyuan.com/bc/10839.html
} 文章源自菜鸟学院-https://www.cainiaoxueyuan.com/bc/10839.html
echo type_weak(2, '3' ,); 文章源自菜鸟学院-https://www.cainiaoxueyuan.com/bc/10839.html
echo "<hr>" ; 文章源自菜鸟学院-https://www.cainiaoxueyuan.com/bc/10839.html
echo sum(2, '3' ,); 文章源自菜鸟学院-https://www.cainiaoxueyuan.com/bc/10839.html
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运行效果图如下:文章源自菜鸟学院-https://www.cainiaoxueyuan.com/bc/10839.html
文章源自菜鸟学院-https://www.cainiaoxueyuan.com/bc/10839.html
返回值文章源自菜鸟学院-https://www.cainiaoxueyuan.com/bc/10839.html
<?php 文章源自菜鸟学院-https://www.cainiaoxueyuan.com/bc/10839.html
declare (strict_types=0); 文章源自菜鸟学院-https://www.cainiaoxueyuan.com/bc/10839.html
function type_weak(... $int ) :int{ 文章源自菜鸟学院-https://www.cainiaoxueyuan.com/bc/10839.html
return array_sum ( $int ); 文章源自菜鸟学院-https://www.cainiaoxueyuan.com/bc/10839.html
} 文章源自菜鸟学院-https://www.cainiaoxueyuan.com/bc/10839.html
function sum(int ... $ints ) :int 文章源自菜鸟学院-https://www.cainiaoxueyuan.com/bc/10839.html
{ 文章源自菜鸟学院-https://www.cainiaoxueyuan.com/bc/10839.html
print_r( $ints ); 文章源自菜鸟学院-https://www.cainiaoxueyuan.com/bc/10839.html
echo "<br>" ; 文章源自菜鸟学院-https://www.cainiaoxueyuan.com/bc/10839.html
return array_sum ( $ints )+ 文章源自菜鸟学院-https://www.cainiaoxueyuan.com/bc/10839.html
} 文章源自菜鸟学院-https://www.cainiaoxueyuan.com/bc/10839.html
echo type_weak(2, '3' ,); 文章源自菜鸟学院-https://www.cainiaoxueyuan.com/bc/10839.html
echo "<hr>" ; 文章源自菜鸟学院-https://www.cainiaoxueyuan.com/bc/10839.html
echo sum(2, '3' ,); 文章源自菜鸟学院-https://www.cainiaoxueyuan.com/bc/10839.html
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文章源自菜鸟学院-https://www.cainiaoxueyuan.com/bc/10839.html