PHP – 在“===”中首先评估什么？类型或值相等？

>它会首先检查类型,如果它们不同,它会将其中一个转换为相同,
>然后它将检查值是否等于,

因此,首先要评估Type.

编辑

参考artragis答案
下面是is_identical_function php 5.4.8的完整源代码(感谢artragis)

ZEND_API int is_identical_function(zval *result,zval *op1,zval *op2 TSRMLS_DC) /* {{{ */
    {
        Z_TYPE_P(result) = IS_BOOL;
        if (Z_TYPE_P(op1) != Z_TYPE_P(op2)) {
            Z_LVAL_P(result) = 0;
            return SUCCESS;
        }
        switch (Z_TYPE_P(op1)) { // here it will check the Type and below it will check the value
            case IS_NULL:
                Z_LVAL_P(result) = 1;
                break;
            case IS_BOOL:
            case IS_LONG:
            case IS_RESOURCE:
                Z_LVAL_P(result) = (Z_LVAL_P(op1) == Z_LVAL_P(op2));
                break;
            case IS_DOUBLE:
                Z_LVAL_P(result) = (Z_DVAL_P(op1) == Z_DVAL_P(op2));
                break;
            case IS_STRING:
                Z_LVAL_P(result) = ((Z_STRLEN_P(op1) == Z_STRLEN_P(op2))
                    && (!memcmp(Z_STRVAL_P(op1),Z_STRVAL_P(op2),Z_STRLEN_P(op1))));
                break;
            case IS_ARRAY:
                Z_LVAL_P(result) = (Z_ARRVAL_P(op1) == Z_ARRVAL_P(op2) ||
                    zend_hash_compare(Z_ARRVAL_P(op1),Z_ARRVAL_P(op2),(compare_func_t) hash_zval_identical_function,1 TSRMLS_CC)==0);
                break;
            case IS_OBJECT:
                if (Z_OBJ_HT_P(op1) == Z_OBJ_HT_P(op2)) {
                    Z_LVAL_P(result) = (Z_OBJ_HANDLE_P(op1) == Z_OBJ_HANDLE_P(op2));
                } else {
                    Z_LVAL_P(result) = 0;
                }
                break;
            default:
                Z_LVAL_P(result) = 0;
                return FAILURE;
        }
        return SUCCESS;
    }