我试图理解这两个lambda和闭包函数的用法。但无法正确理解。如果我能用插图和细节来理解它，那就太好了。
$array = array(12345, 'abcde');
$lambda = function($value) { return md5($value); };
$closure = function($value) use ($lambda) {
return 'MD5 Hash: ' . $lambda($value);//what is $lambda($value) here?
};
$result = array_map($closure, $array);
var_dump($result);
//array (size=2)
//0 => string 'MD5 Hash: 827ccb0eea8a706c4c34a16891f84e7b' (length=42)
//1 => string 'MD5 Hash: ab56b4d92b40713acc5af89985d4b786' (length=42)
可读的翻译版本希望它有助于更好地理解lambdas（php匿名函数）和闭包（可以访问变量的匿名函数）。
参考： http://php.net/manual/en/class.closure.php
<?php
$array = array(12345, 'abcde');
// Returns a value's md5.
function getNonLambdaMd5( $value )
{
return md5($value);
}
// Pre-pends 'MD5 Hash: ' text to md5 values.
function getNonClosureWrapperText( $value )
{
return 'MD5 Hash: ' . getNonLambdaMd5( $value );
}
// Array_Map replacer to loop through all values within the array.
$iCountValues = count( $array );
for( $i = 0; $i < $iCountValues; ++$i )
{
// Add each to the result.
$result[] = getNonClosureWrapperText( $array[ $i ] );
}
var_dump($result);
//array (size=2)
//0 => string 'MD5 Hash: 827ccb0eea8a706c4c34a16891f84e7b' (length=42)
//1 => string 'MD5 Hash: ab56b4d92b40713acc5af89985d4b786' (length=42)
?>