怎么办!==和==PHP中的平均值?[副本]

if (4 === 4) // same value and type
{
  // true
}

if (4 == "4") // same value and different type but == used
{
  // true
}

if (4 === "4") // same value but different type
{
  // false
}

== ===

• http://php.net/manual/en/types.comparisons.php

1 == 1
1 == "1"
1 === 1
1 !== "1"
true === true
true !== "true"
true == "true"

this link

"1" == 1 "1" === 1

if (strpos('hello', 'hello world!'))

if (strpos('hello', 'hello world!') !== false)

==

if( '1' == 1 ) { echo 'yes'; }

===

if( '1' === 1 ) { /* this will not work */ }

'1' string 1 integer number

if( (integer) '1' === 1 ) { echo 'this works'; }